Since we are doing type-checking we are dealing with mutually excluding conditions.
So far the code blocks for non-string type matching will transform `$value` into a string anyway so if we have an object, the null value or a bool we would get a string and any further test would be not needed for it. W only need to test the unprocessed value, i.e. other conditions on the input value.
Now the code reads like this:
object? => get a string
or null? => get an (empty) string
or bool? => get a (numeric|empty) string
or array? => build a string
or if anything else but a string => cast to string
Off-Topic:
shouldn't be better to use `null === $var` / `null !== $var` instead of calling `is_null`. Inside a function that can be called many times it can make a diifference in processing time since calling a function is more expensive, even though i agree to be more consistent with other type-checking.
kind regards
