Pure version of Number constructor

[trosos]

Hi,
Is there a technical or philosophical reason not to have a pure version of the Number constructor?

I would appreciate it for transpiling things like Number("0b11") (using babel-plugin-transform-runtime).

Thank you for a great project!

[zloirock]

Hi. It's a technical problem.

It's not a problem to add a pure polyfill for it, it's a problem to make it work with babel-plugin-transform-runtime as expected in all cases.

Initially, it was added, but it broke some projects, and after it was removed.

For example, someone checks a type like this:

const number = 1;

number.constructor === Number; // => true

But with runtime, we could have:

const _Number = require(/* something */);

const number = 1;

number.constructor === _Number; // => false

and vice versa.

It can work as expected only in the case of patching built-in prototypes, but it contradicts the pure nature.

[trosos]

This makes sense, thank you for explanation.

Anyway, as the pure polyfill would still be useful for people who directly import it from core-js-pure (hence, they know what they are doing), would you not be opposed to merging a PR implementing it?

There is no pressure to integrate it with babel-plugin-transform-runtime.

[zloirock]

Hmm, why not. On reviewing old features, I thought about returning it without exposing it to runtime.