TO DO list for PercentFormat
============================

TO DO list for PercentFormat, more or less in order:

* when `%s` argument is char, generate `<char>` instead of `'<char>'`;

* when `%i`/`%f`/etc argument is a number encoded in a string, parse the number
  and make it work;

* add `%e` and `%E`;

* add `%q` (see `tests/test-number.hs`);

* sweep `TODO`s scattered through files;

* interpret precision in `%r` as prec of showsPrec;

* *maybe*: make "%l" for lists:

        > "%l" % [1,2,3] -- regular
        [1,2,3]
        > "% l" % [1,2,3] -- add spaces
        [1, 2, 3]
        > "%\nl" % [1,2,3] -- add linebreaks
        [ 1
        , 2
        , 3 ]