Beancount cloned with hg at 2017-12-27 22:14 EST
Python 3.5.3 running on Ubuntu 14.04

In the following bean file, I purchase $1,000.00 of a Vanguard fund. 
Vanguard reports shares to three decimal places.

option "operating_currency" "USD"
option "booking_algorithm" "FULL"

2017-12-01 commodity USD
2017-12-01 commodity VFIAX

2017-12-01 open Assets:Checking
2017-12-01 open Equity:Opening-Balances
2017-12-01 open Assets:Vanguard     VFIAX "FIFO"

2017-12-01 * "Opening balance"
  Assets:Checking           1000.00 USD
  Equity:Opening-Balances

2017-12-27 * "Buy retirement fund shares"
  Assets:Vanguard           4.039 VFIAX {}
  Assets:Checking           -1000.00 USD

Using bean-web, in the trail balance report for all transactions, the USD 
column totals -0.00 and the total balance is -0.0000000000000000000000001 
USD. Other reports appear correct.

The share purchase transaction details show a basis of 
999.9999999999999999999999999 USD instead of 1000.00 USD. *How can I 
configure Beancount to round the basis to the customary two decimal places 
for USD?*

Hash:4baf7306f442bd171b65dd8a83e8390f
Location: /home/joel/projects/accounting/vanguard.bean:15

------------ Balances before transaction

  Assets:Vanguard                                                   

  Assets:Checking                                        1000.00 USD


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

2017-12-27 * "Buy retirement fund shares"
  Assets:Vanguard     4.039 VFIAX {247.59 USD, 2017-12-27}  ; 
999.9999999999999999999999999 USD
  Assets:Checking  -1000.00 USD                             ;                   
   -1000.00 USD


Residual: (-0.0000000000000000000000001 USD)
Tolerances: USD=0.005
Basis: (999.9999999999999999999999999 USD)

------------ Balances after transaction

* Assets:Vanguard  4.039 VFIAX {247.5860361475612775439465214 USD, 2017-12-27}

  Assets:Checking

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