Altering python's core datatypes is not what I'd call minor.
They don't even mention the changes to `list`.
> Integers: Codon's int is a 64-bit signed integer, whereas Python's (after version 3) can be arbitrarily large. However Codon does support larger integers via Int[N] where N is the bit width.
> Dictionaries: Codon's dictionary type does not preserve insertion order, unlike Python's as of 3.6.
> Tuples: Since tuples compile down to structs, tuple lengths must be known at compile time, meaning you can't convert an arbitrarily-sized list to a tuple, for instance.
wtf this is a supper big issue making this basically unusable for anything handling text (and potentially even just fixed indents, if you aren't limited to EU+US having non us-ascii idents in code or text is common, i.e. while EU companies most times code in english this is much less likely in Asia, especially China and Japan.
it isn't even really a performance benefit compared to utf-8 as utf-8 only using us-ascii letters _is_ us-ascii and you don't have to use unicode aware string operations
