> config variable names are technically case-insensitive while this case
> construct is by default case-sensitive. Moving it to case-insensitive
> could be a lot more work.
Bash v4 supports the case modification expansion in the form of
${prev,,}. Alas OSX (or older LTS/Enterprise Linux
config variable names are technically case-insensitive while this case
construct is by default case-sensitive. Moving it to case-insensitive
could be a lot more work. Instead let's just accept the form that is
more likely to show up in practice.
Signed-off-by: Nguyễn Thái Ngọc Duy
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