Motivation: There are a lot of specific characters mentioned in How to solve the `Package inputenc Error: Unicode char not set up for use with LaTeX` problem? (This question can be considered as an extension to it) There are even more questions on this this asking about similar errors for specific characters. I know that some of the characters can be properly handled by
inputenc if you include the proper packages, but is there a list (even incomplete) on which unicode characters are implemented in which packages or is there a general guide on how to find such a package if I encounter a specific character that reports these errors?
Note: I know that I can manually do
\DeclareUnicodeCharacter for the problematic ones and I also know the options of using LuaTeX and XeTeX as mentioned in the only comment of the linked question, but I still believe such a table/mapping can be helpful to the general public if it does exist, especially if it is indexed by Unicode code points.
As a specific example, maybe a demonstration of how to find which package includes "parenthesized Latin small letter a ⒜ (U+249C)" is helpful. (Not which package to use, but how to find those packages).
I will also be happy to accept an answer claiming such a table/list does not/should not exist with sound evidence.
Edit: With the help of the answer by @David Carlisle I found this related question: Mapping from Unicode character to LaTeX-Symbol for BibTeX?