[issue7098] g formatting for decimal types should always strip trailing zeros.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> It should strip all trailing zeros from the result:

Hmm.  Thinking about this some more, I don't think this is true:  format() shouldn't be throwing away significant information (in Decimal 
the number of trailing zeros *is* significant information) unless that's 
necessary to fit the result into the given precision.

So I think the current code is correct.

However, we could do with documenting the precise rules being used for 
Decimal formatting somewhere.

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