Compare also:
-- >8 --
$ a=$'a\0b'
$ $ $ $ $ $
$ echo ${#a}
1
$ a=$'a\0b'asdasdasdasd
$ echo ${#a}
13
$ printf '%s\n' "$a"
aasdasdasdasd
-- >8 --
(the escaping behaviour is correct, the results are correct)
The minimum that doesn't hang is
a=$'a\0b'aaaaa
and the five as match up thusly length-wise:
a\0b'
aaaaa
so, knowing nothing about the parser,
i'm gonna assume Some cursor isn't being properly advanced
while inside $'?
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