IsStringLiteral should be false for branded and tagged types

[cjquines]

i would expect these to return false, as these are not string literals

import type {IsStringLiteral, Tagged} from 'type-fest';

type A = IsStringLiteral<Tagged<string, "UserId">>; // true
type B = IsStringLiteral<string & { _type: "UserId" }>; // true

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