Eric V. Smith <e...@trueblade.com> added the comment:

A few things:

- There is no %-formatting for Decimal types. They're being converted to float 
first. That's why it appears that %-formatting with 'g' works the same for 
decimal and float: you're really just calling the float version.

- The difference in 'g' formatting between float and Decimal is a known 
difference. This issue pops up every now and again, but right now I can't find 
where (or if) it's actually documented.

Mark: can you point to it? I don't think 
https://docs.python.org/3/library/string.html#format-specification-mini-language
 mentions it where it talks about Decimals. And I don't see any documentation 
for Decimal.__format__.

----------
nosy: +eric.smith, mark.dickinson

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<https://bugs.python.org/issue42429>
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