Willing to fix a TODO case in libpq module

Hi,all

On website: https://wiki.postgresql.org/wiki/Todo#libpq
I found that in libpq module,there is a todo case:
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Prevent PQfnumber() from lowercasing unquoted column names
PQfnumber() should never have been doing lowercasing, but historically it has so we need a way to prevent it

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I am interested in this one. So ,Had it be fixed?
If not, I am willing to do so.
In that way ,could anyone tell me the detail features of this function it supported to be?
I will try to fix it~

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Best Regards
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Wu Fei
DX3
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
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