2.1.9 [ECMA-262/6] Section 126.96.36.199 [[Delete]] (P)
V0038: [[Delete]] removes the property even if the configurable property is false
The specification states:
188.8.131.52 [[Delete]] (P) The [[Delete]] internal method of an arguments exotic object when called with a property key P performs the following steps: 1. Let map be the value of the [[ParameterMap]] internal slot of the arguments object. 2. Let isMapped be HasOwnProperty(map, P). 3. Assert: isMapped is not an abrupt completion. 4. Let result be the result of calling the default [[Delete]] internal method for ordinary objects (9.1.10) on the arguments object passing P as the argument. 5. ReturnIfAbrupt(result). 6. If result is true and the value of isMapped is true, then a. Call map.[[Delete]](P). 7. Return result.
IE11 Mode (All versions)
In step 4, the
internal method removes the property even if the
property is false.