wrong WebGLRenderingContext interface definition about gl.pixelStore

[ReadingSteiner]

TypeScript Version: 2.1.4

Code

gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true)

Expected behavior:
well compiled

Actual behavior:
error TS2345: Argument of type 'true' is not assignable to parameter of type 'number'

I checked the lib.d.ts and got this

pixelStorei(pname: number, param: number): void;

but it should be

pixelStorei(pname: number, param: number | boolean): void;

check this API at MDN here

[mhegazy]

PRs welcomed. You can find more information about contributing lib.d.ts fixes at https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md#contributing-libdts-fixes.