beancount throws exceptions for amounts over 1 billion

[Justus Pendleton]

The Fix for bug #584 -- https://github.com/beancount/beancount/commit/4c1e87bb5a6883f8217a495de5d0ddae109aa289 -- introduced the code:

# Allow precision for numbers as large as 1 billion in addition to

# the required number of fractional digits.

#

# TODO(blais): Review this to assess performance impact, and whether

# we could fold this outside a calling loop.

ctx.prec = num_fractional_digits + 9

The result is that any amount over 1 billion (e.g. in a bean-query) results in an exception:

decimal.InvalidOperation: [<class 'decimal.InvalidOperation'>]

For my personal usage I can just increase the 9 to a 12 or whatever I need but I wanted to ask if there's a better approach so I can try to submit an actual patch?

Cheers,

Justus