I would like to request RFC karma to formally propose the deprecation of a small set of legacy type alias functions:
• is_double as an alias of is_float
• is_integer and is_long as aliases of is_int
• doubleval as an alias of floatval
You'll need RFC karma either way, but it's probably best to include that as part of the PHP 8.6 bulk deprecation RFC. It's a small follow-up to a previous deprecation and it's probably not useful to discuss and vote that one on its own, since the discussion probably is not going to be particularly insightful.