The handler.preventExtensions() method is a trap for the [[PreventExtensions]] object internal method, which is used by operations such as Object.preventExtensions().

The handler.setPrototypeOf() method is a trap for the [[SetPrototypeOf]] object internal method, which is used by operations such as Object.setPrototypeOf().

The Reflect.getPrototypeOf() static method is like Object.getPrototypeOf(). It returns the prototype of the specified object.

The BigInt64Array() constructor creates BigInt64Array objects. The contents are initialized to 0n unless initialization data is explicitly provided.

The reduce() method of Iterator instances is similar to Array.prototype.reduce: it executes a user-supplied "reducer" callback function on each element produced by the iterator, passing in the return value from the calculation on the preceding element. The final result of running the reducer across all elements is a single value.

The [Symbol.iterator]() method of Segments instances implements the iterable protocol and allows Segments objects to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns a segments iterator object that yields data about each segment.

The filter() method of Iterator instances returns a new iterator helper object that yields only those elements of the iterator for which the provided callback function returns true.

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