= private = protected
<(p1)
Returns true if hash is subset of other.
h1 = {a:1, b:2} h2 = {a:1, b:2, c:3} h1 < h2 #=> true h2 < h1 #=> false h1 < h1 #=> false
static VALUE rb_hash_lt(VALUE hash, VALUE other) { other = to_hash(other); if (RHASH_SIZE(hash) >= RHASH_SIZE(other)) return Qfalse; return hash_le(hash, other); }