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For an instance of Hash, returns self.
For a subclass of Hash, returns a new Hash containing the content of self.
When a block is given, returns a new Hash object whose content is based on the block; the block should return a 2-element Array object specifying the key-value pair to be included in the returned Array:
h = {foo: 0, bar: 1, baz: 2}
h1 = h.to_h {|key, value| [value, key] }
h1 # => {0=>:foo, 1=>:bar, 2=>:baz}
               static VALUE
rb_hash_to_h(VALUE hash)
    if (rb_block_given_p()) {
        return rb_hash_to_h_block(hash);
    if (rb_obj_class(hash) != rb_cHash) {
        const VALUE flags = RBASIC(hash)->flags;
        hash = hash_dup(hash, rb_cHash, flags & RHASH_PROC_DEFAULT);
    return hash;

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