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Duplicates a given hash and adds a ruby2_keywords flag. This method is not for casual use; debugging, researching, and some truly necessary cases like deserialization of arguments.
h = {k: 1}
h = Hash.ruby2_keywords_hash(h)
def foo(k: 42)
foo(*[h]) #=> 1 with neither a warning or an error
               static VALUE
rb_hash_s_ruby2_keywords_hash(VALUE dummy, VALUE hash)
    Check_Type(hash, T_HASH);
    hash = rb_hash_dup(hash);
    RHASH(hash)->basic.flags |= RHASH_PASS_AS_KEYWORDS;
    return hash;

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