We have seen a compatibility break from versions 0.5.0+ in Recase.to_snake/1. This happens when there are multiple uppercase letters followed by lowercase ones as you can see in the example with "CurrencyISOCode":

Versions 0.5+

iex(2)> Recase.to_snake("CurrencyISOCode")
"currency_isocode"

Previos versions <= 0.4

iex(2)> Recase.to_snake("CurrencyISOCode")
"currency_iso_code"

Is that intended? For the moment we are pinning the dependency to v0.4.0