Toggleable `JsValue` internals displaying (#1865)

This PR makes `JsValue` (object) only display owned properties, cleans up object printing. This can be toggled with `value.display().internals(true)`

`>> ({x: 1, y: ""})`
_Before:_
<details>
<pre>
{
   x: 1,
   y: "",
__proto__: {
hasOwnProperty: {
      length: 1,
        name: "hasOwnProperty",
   __proto__: {
            name: "",
          length: 0,
           apply: {
              length: 1,
                name: "apply",
           __proto__: [Cycle]
                },
            bind: {
              length: 1,
                name: "bind",
           __proto__: [Cycle]
                },
            call: {
              length: 1,
                name: "call",
           __proto__: [Cycle]
                },
        toString: {
              length: 0,
                name: "toString",
           __proto__: [Cycle]
                },
     constructor: {
              length: 1,
                name: "Function",
           prototype: [Cycle],
           __proto__: [Cycle]
                },
Symbol(Symbol.hasInstance): {
              length: 1,
                name: "[Symbol.iterator]",
           __proto__: [Cycle]
                },
       __proto__: [Cycle]
            }
        },
propertyIsEnumerable: {
      length: 1,
        name: "propertyIsEnumerable",
   __proto__: {
            name: "",
          length: 0,
           apply: {
              length: 1,
                name: "apply",
           __proto__: [Cycle]
                },
            bind: {
              length: 1,
                name: "bind",
           __proto__: [Cycle]
                },
            call: {
              length: 1,
                name: "call",
           __proto__: [Cycle]
                },
        toString: {
              length: 0,
                name: "toString",
           __proto__: [Cycle]
                },
     constructor: {
              length: 1,
                name: "Function",
           prototype: [Cycle],
           __proto__: [Cycle]
                },
Symbol(Symbol.hasInstance): {
              length: 1,
                name: "[Symbol.iterator]",
           __proto__: [Cycle]
                },
       __proto__: [Cycle]
            }
        },
toString: {
      length: 0,
        name: "toString",
   __proto__: {
            name: "",
          length: 0,
           apply: {
              length: 1,
                name: "apply",
           __proto__: [Cycle]
                },
            bind: {
              length: 1,
                name: "bind",
           __proto__: [Cycle]
                },
            call: {
              length: 1,
                name: "call",
           __proto__: [Cycle]
                },
        toString: {
              length: 0,
                name: "toString",
           __proto__: [Cycle]
                },
     constructor: {
              length: 1,
                name: "Function",
           prototype: [Cycle],
           __proto__: [Cycle]
                },
Symbol(Symbol.hasInstance): {
              length: 1,
                name: "[Symbol.iterator]",
           __proto__: [Cycle]
                },
       __proto__: [Cycle]
            }
        },
 valueOf: {
      length: 0,
        name: "valueOf",
   __proto__: {
            name: "",
          length: 0,
           apply: {
              length: 1,
                name: "apply",
           __proto__: [Cycle]
                },
            bind: {
              length: 1,
                name: "bind",
           __proto__: [Cycle]
                },
            call: {
              length: 1,
                name: "call",
           __proto__: [Cycle]
                },
        toString: {
              length: 0,
                name: "toString",
           __proto__: [Cycle]
                },
     constructor: {
              length: 1,
                name: "Function",
           prototype: [Cycle],
           __proto__: [Cycle]
                },
Symbol(Symbol.hasInstance): {
              length: 1,
                name: "[Symbol.iterator]",
           __proto__: [Cycle]
                },
       __proto__: [Cycle]
            }
        },
isPrototypeOf: {
      length: 1,
        name: "isPrototypeOf",
   __proto__: {
            name: "",
          length: 0,
           apply: {
              length: 1,
                name: "apply",
           __proto__: [Cycle]
                },
            bind: {
              length: 1,
                name: "bind",
           __proto__: [Cycle]
                },
            call: {
              length: 1,
                name: "call",
           __proto__: [Cycle]
                },
        toString: {
              length: 0,
                name: "toString",
           __proto__: [Cycle]
                },
     constructor: {
              length: 1,
                name: "Function",
           prototype: [Cycle],
           __proto__: [Cycle]
                },
Symbol(Symbol.hasInstance): {
              length: 1,
                name: "[Symbol.iterator]",
           __proto__: [Cycle]
                },
       __proto__: [Cycle]
            }
        },
constructor: {
      create: {
          length: 2,
            name: "create",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
setPrototypeOf: {
          length: 2,
            name: "setPrototypeOf",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
getPrototypeOf: {
          length: 1,
            name: "getPrototypeOf",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
defineProperty: {
          length: 3,
            name: "defineProperty",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
defineProperties: {
          length: 2,
            name: "defineProperties",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
      assign: {
          length: 2,
            name: "assign",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
          is: {
          length: 2,
            name: "is",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
        keys: {
          length: 1,
            name: "keys",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
      values: {
          length: 1,
            name: "values",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
     entries: {
          length: 1,
            name: "entries",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
        seal: {
          length: 1,
            name: "seal",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
    isSealed: {
          length: 1,
            name: "isSealed",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
      freeze: {
          length: 1,
            name: "freeze",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
    isFrozen: {
          length: 1,
            name: "isFrozen",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
preventExtensions: {
          length: 1,
            name: "preventExtensions",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
isExtensible: {
          length: 1,
            name: "isExtensible",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
getOwnPropertyDescriptor: {
          length: 2,
            name: "getOwnPropertyDescriptor",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
getOwnPropertyDescriptors: {
          length: 1,
            name: "getOwnPropertyDescriptors",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
getOwnPropertyNames: {
          length: 1,
            name: "getOwnPropertyNames",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
getOwnPropertySymbols: {
          length: 1,
            name: "getOwnPropertySymbols",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
      hasOwn: {
          length: 2,
            name: "hasOwn",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
 fromEntries: {
          length: 1,
            name: "fromEntries",
       __proto__: {
                name: "",
              length: 0,
               apply: {
                  length: 1,
                    name: "apply",
               __proto__: [Cycle]
                    },
                bind: {
                  length: 1,
                    name: "bind",
               __proto__: [Cycle]
                    },
                call: {
                  length: 1,
                    name: "call",
               __proto__: [Cycle]
                    },
            toString: {
                  length: 0,
                    name: "toString",
               __proto__: [Cycle]
                    },
         constructor: {
                  length: 1,
                    name: "Function",
               prototype: [Cycle],
               __proto__: [Cycle]
                    },
Symbol(Symbol.hasInstance): {
                  length: 1,
                    name: "[Symbol.iterator]",
               __proto__: [Cycle]
                    },
           __proto__: [Cycle]
                }
            },
      length: 1,
        name: "Object",
   prototype: [Cycle],
   __proto__: {
            name: "",
          length: 0,
           apply: {
              length: 1,
                name: "apply",
           __proto__: [Cycle]
                },
            bind: {
              length: 1,
                name: "bind",
           __proto__: [Cycle]
                },
            call: {
              length: 1,
                name: "call",
           __proto__: [Cycle]
                },
        toString: {
              length: 0,
                name: "toString",
           __proto__: [Cycle]
                },
     constructor: {
              length: 1,
                name: "Function",
           prototype: [Cycle],
           __proto__: [Cycle]
                },
Symbol(Symbol.hasInstance): {
              length: 1,
                name: "[Symbol.iterator]",
           __proto__: [Cycle]
                },
       __proto__: [Cycle]
            }
        },
__proto__: null
    }
}
</pre>
</details>

_After:_
```text
{
   x: 1,
   y: ""
}
```

boa_engine/src/value/display.rs

@@ -6,6 +6,18 @@ use super::{fmt, Display, HashSet, JsValue, PropertyKey};
 #[derive(Debug, Clone, Copy)]
 pub struct ValueDisplay<'value> {
     pub(super) value: &'value JsValue,
+    pub(super) internals: bool,
+}
+
+impl ValueDisplay<'_> {
+    /// Display internal information about value.
+    ///
+    /// By default this is `false`.
+    #[inline]
+    pub fn internals(mut self, yes: bool) -> Self {
+        self.internals = yes;
+        self
+    }
 }
 
 /// A helper macro for printing objects
@@ -275,7 +287,9 @@ impl Display for ValueDisplay<'_> {
             },
             JsValue::String(ref v) => write!(f, "\"{v}\""),
             JsValue::Rational(v) => format_rational(*v, f),
-            JsValue::Object(_) => write!(f, "{}", log_string_from(self.value, true, true)),
+            JsValue::Object(_) => {
+                write!(f, "{}", log_string_from(self.value, self.internals, true))
+            }
             JsValue::Integer(v) => write!(f, "{v}"),
             JsValue::BigInt(ref num) => write!(f, "{num}n"),
         }

boa_engine/src/value/mod.rs

@@ -494,6 +494,9 @@ impl JsValue {
 
     /// Returns an object that implements `Display`.
     ///
+    /// By default the internals are not shown, but they can be toggled
+    /// with [`ValueDisplay::internals`] method.
+    ///
     /// # Examples
     ///
     /// ```
@@ -505,7 +508,10 @@ impl JsValue {
     /// ```
     #[inline]
     pub fn display(&self) -> ValueDisplay<'_> {
-        ValueDisplay { value: self }
+        ValueDisplay {
+            value: self,
+            internals: false,
+        }
     }
 
     /// Converts the value to a string.

boa_tester/src/exec/mod.rs

@@ -206,8 +206,11 @@ impl Test {
                                 match context.eval(&self.content.as_ref()) {
                                     Ok(res) => (false, res.display().to_string()),
                                     Err(e) => {
-                                        let passed =
-                                            e.display().to_string().contains(error_type.as_ref());
+                                        let passed = e
+                                            .display()
+                                            .internals(true)
+                                            .to_string()
+                                            .contains(error_type.as_ref());
 
                                         (passed, format!("Uncaught {}", e.display()))
                                     }