Unexpected result converting to canonical type

[labkey-matthewb]

    Decimal m = ucum.convert(new Decimal("1",15), "[mi_i]","m");
    System.out.println("one mile = " + m + "m expect 1609.344");

Internally convert() first correctly converts 1[mi_i] to canonical unit [m] as 1609.344 but the
conversion from canonical [m] to destination type [m] converts 1609.344 to 1609 because
the identity conversion m->m uses Decimal("1",precision=1)

I would expect the unity conversion to be a noop.

[grahamegrieve]

I think this is an error in UCUM itself. The UCUM value for inch is given as 2.54cm, which is a precision of 3, so 1 mile is 1.60e3m - which becomes 1609 in decimal form. The correct conversion value is 2.539999962 - so raise an issue against UCUM