Jsonify breaks down with JsonValue, JsonObject

[oleg-codaio]

I was trying to use Jsonify with a generic class and noticed things would break if I happened to pass in a type already using JsonValue or JsonObject:

// type Foo = {[x: string]: never}
type Foo = Jsonify<JsonObject>

// Type instantiation is excessively deep and possibly infinite.ts(2589)
type Bar = Jsonify<JsonValue>;

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[sindresorhus]

Good catch. We should check for those types and just return the types directly if matched.