Feature request

I think it would be helpful, if phpstan would support simple substr() transformation on constant values, e.g. when converting between ISO standard strings or similar

https://phpstan.org/r/821608f5-b8e3-4637-89f0-add66e8730ed

I can work on it, if we agree its useful.