Php::Value::numericValue() does not play well with references

[sjinks]

static void swap(Php::Parameters& params)
{
    Php::Value temp = params[0];
    params[0] = params[1];
    params[1] = temp;
    std::cout << params[0].numericValue() << ' ' << params[1].numericValue() << ' ' << std::endl;
}

/// ...

e.add<swap>("swap", {
    Php::ByRef("a", Php::Type::Numeric),
    Php::ByRef("b", Php::Type::Numeric)
});

This will print weird values.

[sjinks]

bool Value::isNumeric() const
{
    // if we're a number we simply return true
    if (type() == Type::Numeric) return true;

    // derefence ourselves and check the type of that
    return ((Type) Z_TYPE_P(_val.dereference())) == Type::Numeric;
}

if (isNumeric()) return Z_LVAL_P(_val);

In case of a reference, numericValue() will still use Z_LVAL_P producing an incorrect result.

Same is true for isFloat() / floatValue()