IsLiteral should not require the type to be Primitive but check it internally

[kkmuffme]

Not sure why the IsLiteral type has a restriction, while other literal types don't have (neither do most other types)

export type IsLiteral<T extends Primitive> = IsNotFalse<IsLiteralUnion<T>>;

should be:

export type IsLiteral<T> = T extends Primitive ? IsNotFalse<IsLiteralUnion<T>> : false;

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[sindresorhus]

Agreed