Like a Set, but provides the index of the `key` in the backing array
ES6 spec-compliant RegExp.prototype.flags shim.
If available, the `Object.prototype.__proto__` accessor and mutator, call-bound
Detect native Symbol.toStringTag support.
Detect native Uint16Array support.
Test if a double-precision floating-point numeric value is NaN.
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Detect native Float64Array support.
Check if an environment is big endian.
Detect native Uint8Array support.
Test if a value is an object.
Test if a value is an array.
Detect native Float32Array support.
Detect native Uint32Array support.
Detect native Symbol support.
Power Assert feature enhancer for assert function/object
Return a function which tests if every element in an array passes a test condition.
Power Assert feature enhancer for assert function/object
format power-assert context
Test if a value is a string.
Test if a value is a number.
Test if a value is a Float32Array.
Test if an object has a specified property.
Test if a value is a function.