zero numbers are written as empty cell

[uhucrew]

Numbers with zero value become an empty cell in the export. The Problem is here, 0 || "" evaluates to an empty string, not the number zero:
src/index.coffee:56
@_addCell(obj[key] || "", col + 1)

Possibly this is a fix? (I'm not familiar with coffescript):
@_addCell(obj[key] === 0 ? 0 : obj[key] || "", col + 1)