Re: [RFC] [Discussion] Literal Scalar Types

Hi On 6/15/26 03:22, Seifeddine Gmati wrote:

I'd like to start the discussion on a new RFC adding literal scalar types to PHP. - RFC: https://wiki.php.net/rfc/literal_scalar_types - Implementation: https://github.com/php/php-src/pull/22314

I have given the RFC a quick first review pass and would suggest to leave out support for float literals. From a conceptual perspective floats are much closer to being continuous values than they are to discrete values and picking individual values from a continuous range is typically not all that useful. Support for floats is also going to invite the usual confusion about implicit rounding:

    function tenths(
        0.0|0.1|0.2|0.3|0.4|0.5|0.6|0.7|0.8|0.9 $tenth
    ): void { var_dump($tenth); }

where tenths(0.1 + 0.2) will result in a TypeError. The RFC is also unclear what values are valid floating point literals. As an example, is 4e3 a valid float literal? Is NAN a valid float literal? Best regards Tim Düsterhus