Can't comment lines with '%<number>' -- comment:58: invalid capture index

[AndydeCleyre]

micro 2.0.3
comment 1.0.0

$ mkdir newconf
$ micro -config-dir newconf filename

Type lines:

one
two
%3

Try commenting each, with alt+/. Commenting the third line fails:

comment:58: invalid capture index
stack traceback:
        [G]: in function 'gsub'
        comment:58: in function 'commentLine'
        comment:96: in main chunk
        [G]: ?

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