Transaction does not balance with @@: -0.000000000000000000000001

[blais]

Original report by Martin Michlmayr (Bitbucket: tbm13, GitHub: tbm).

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2014-01-01 open Assets:Test

2018-03-20 * "Test"
  Assets:Test                42.30 USD @@ 5640 MR
  Assets:Test                            -5640 MR

gives

Clearly it should balance but it doesn't because of rounding when you convert from a total price to a unit price.

Maybe beancount should automatically infer a tolerance of whatever the precsion of the datatype you use to store is.

Also, another argument for issue #194 to somehow store the total price/cost.

[blais]

Original comment by Martin Michlmayr (Bitbucket: tbm13, GitHub: tbm).

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I just noticed I was running an old version. Anyway, this is still there:

Transaction does not balance: (-0.000000000000000000000001 MR)

[blais]

Original comment by Martin Michlmayr (Bitbucket: tbm13, GitHub: tbm).

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Issue #384 has another test case for the same issue.

[blais]

Original comment by Martin Blais (Bitbucket: blais, GitHub: blais).

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This is due to inference; working as expected.
If you use bean-doctor context you will see the absence of an inferred tolerance for MR (understandably, there are no digits):

#!python

------------ Transaction

2018-03-20 * "Test"
  Assets:Test  42.30 USD @ 133 MR  ; 5639.999999999999999999999999 MR
  Assets:Test  -5640 MR            ;                         -5640 MR


Residual: (-0.000000000000000000000001 MR)
Tolerances: USD=0.005

You can get rid of the warning by setting a reasonable default for the inferred tolerance for currency MR:

#!python

option "inferred_tolerance_default" "MR:0.00001"

[blais]

Original comment by Martin Blais (Bitbucket: blais, GitHub: blais).

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Working as intended.

[blais]

Original comment by Martin Michlmayr (Bitbucket: tbm13, GitHub: tbm).

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I think there are 2 problems here:

1. I have 42.30 USD @@ 5640 MR, so why does bean-doctor show 42.30 USD @ 133 MR and not @ 133.3333 (which it clearly uses internally)

2. I disagree this is invalid. I specified @@ 5640 MR, so it should balance just fine. As a user, this error doesn't make any sense and is not working as intended. I know you store things internally in a different way, but this is what's causing the problem. So I think if the residual is as small as the storage type of this variable, then beancount should automatically ignore it.

As a user, I shouldn't need to specify inferred_tolerance_default because the transaction I gave balances 100%. Same with issue #384. The fact that there are two bug reports show that this is not working for users.

[tbm]

Can this be opened?