Step 1. get rid of + for strings, lists, etc. (string/list concatenation
is not addition)
Step 2. add concatenation operator for strings, lists, and basically
anything that can be iterated. effectively an overloadable
itertools.chain. (list cat list = new list, not iterator, but
effectively makes itertools.chain useless.)
Step 3. add decimal concatenation operator for numbers: 2 cat 3 == 23,
22 cat 33 = 2233, etc. if you need bitwise concatenation, you're already
in bitwise "hack" land so do it yourself. (no idea why bitwise is
considered hacky as I use it all the time, but oh well)
Step 4. make it into python 4, since it breaks backwards compatibility.
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