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Lookalike identifiers
=====================
Should look-alike identifiers be considered conflicting?
E.g. `admin` and `adnin`?
Perhaps normalize like this:
i_ -> L
l -> i
n -> m
rn -> m
I -> i
I_ -> L
0 -> O
1 -> i
1_ -> L
2 -> Z
5 -> S
But there needs to be a special case for single-letter variables
(or segments of names), e.g.:
m n
m0 n0
arr_m arr_n
arr_m0 arr_n0
Maybe also (but these break hexadecimal numbers!):
c1 -> d
6 -> b
8 -> B
And perhaps forbid the following
__ (double underscore)
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