Fix 562 dynamic currency rate precision #565
Merged
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Description
Currencies with high nominal values should now convert properly, as we keep track of the rate precision returned by the provider. Unfortunately, in the case of frankfurter and OXR, it is problematic, because they truncate zeros. NBP provides fixed precision, but updates such currencies via table B (once per week). However, frankfurter does not probably even offer such currencies, so it's either lossy OXR (you can try switching days) or NBP.
Closes #562