`FieldArray` - make array helpers more type-safe

[burtek]

Currently used push<X = T[number]>(obj: X): void; allows to push string to number[]. By changing the signature to push<X extends T[number] = T[number]>(obj: X): void; it won't be possible any more.

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[burtek]

Or, we can get rid of generics here altogether and just do push(obj: [number]): void;