Why do you think 0 is not a first class valid value to export?

[codingforfun]

https://github.com/OCA/connector/blame/3dd7b3a1fc58006e747534f54c940f073fa252d8/connector/components/mapper.py#L925

In direct mappings the ExportMapper replaces valid values of 0 with False in the mapping.
This is an invalid and unnecessary assumption about the specification of the meaning of 0 in the external interface we export to. I think this also doesn’t make much sense mathematically or otherwise and therefor is very unexpected behavior.