@achow101 noted we don't reject them therefore they must be silently accepted. This is not part of the specs, we should remove them. Also cc @sipa.

I can take care of this.
}
        ++key_exp_index;
        return std::make_unique<PKHDescriptor>(std::move(pubkey));
    } else if (Func("pkh", expr)) {
        error = "Can only have pkh at top level, in sh(), or in wsh()";
        return nullptr;
    }
    if (ctx == ParseScriptContext::TOP && Func("combo", expr)) {
        auto pubkey = ParsePubkey(key_exp_index, expr, ctx, out, error);
        if (!pubkey) {
            error = strprintf("combo(): %s", error);
            return nullptr;
        }
        ++key_exp_index;
        return std::make_unique<ComboDescriptor>(std::move(pubkey));
    } else if (Func("combo", expr)) {
        error = "Can only have combo() at top level";
        return nullptr;
    }
    const bool multi = Func("multi", expr);
    const bool sortedmulti = !multi && Func("sortedmulti", expr);
    const bool multi_a = !(multi || sortedmulti) && Func("multi_a", expr);
    const bool sortedmulti_a = !(multi || sortedmulti || multi_a) && Func("sortedmulti_a", expr);
    if (((ctx == ParseScriptContext::TOP || ctx == ParseScriptContext::P2SH || ctx == ParseScriptContext::P2WSH) && (multi || sortedmulti)) ||
        (ctx == ParseScriptContext::P2TR && (multi_a || sortedmulti_a))) {
        auto threshold = Expr(expr);
        uint32_t thres;
        std::vector<std::unique_ptr<PubkeyProvider>> providers;
        if (!ParseUInt32(std::string(threshold.begin(), threshold.end()), &thres)) {
            error = strprintf("Multi threshold '%s' is not valid", std::string(threshold.begin(), threshold.end()));