has_key?(p1) public

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rb_hash_has_key(VALUE hash, VALUE key)
    if (RHASH_AR_TABLE_P(hash) && ar_lookup(hash, key, 0)) {
        return Qtrue;
    else if (RHASH_ST_TABLE_P(hash) && st_lookup(RHASH_ST_TABLE(hash), key, 0)) {
        return Qtrue;
    return Qfalse;
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