step: T in global.d.ts

[Rudxain]

• NumericRangeOptions's step is no longer number | number (simplifies to number), it is now T which makes use of the (previously unused) type parameter
• specifies TS version, for reproducibility. Not anymore, because of lib conflicts

[Rudxain]

BTW, I also considered microsoft/TypeScript#31752, but that's hacky and it forces API consumers to define a custom type-guard such as:

type PInfinity = 1e999
const is_pinf = (x: unknown): x is PInfinity => x === Infinity

And the Infinity type in global.d.ts would have to be changed to:

type PInfinity = 1e999
type NInfinity = -1e999
type Inf = PInfinity | NInfinity

[Jack-Works]

thank you!