Hash#compare_by_identity?

hash.compare_by_identity? → true or false

VALUE
rb_hash_compare_by_id_p(VALUE hash)
{
    return RBOOL(RHASH_ST_TABLE_P(hash) && RHASH_ST_TABLE(hash)->type == &identhash);
}

Returns true if compare_by_identity has been called, false otherwise.

See also #compare_by_identity #default #compact! #default= also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0