there are also differences between lib/interpreter versions (str differences, use of Byte arrays) and stuff like Unicode/crypto support, the c-lib used (e.g. mu

there are also differences between lib/interpreter versions (str differences, use of Byte arrays) and stuff like Unicode/crypto support, the c-lib used (e.g. musl). The "provided that" is exactly what I'm sceptical of - if the language is general use, not everyone will play ball unless the language/language-derivative is for the explicit purpose of maintaining this compatibility, and this is somewhat enforced. Python packaging would also be great if it shipped with an unambiguous and bulletproof/portable solution, but it didn't, and then the wheel was (partially) reinvented several times. This is before we even consider bad-actors purposefully attacking (python packages are also susceptible to this I believe).