unit tests for fwrite logical01=TRUE and NAs (#2965)
unit tests for fwrite logical01=TRUE and NAs (#2965)


Rdatatable/data.table,Rdatatable/data.table,jangorecki/data.table,jangorecki/data.table,vlulla/data.table,jangorecki/data.table,Rdatatable/data.table,vlulla/data.table,Rdatatable/data.table,vlulla/data.table,jangorecki/data.table,vlulla/data.table