error occur when one of label is numeric

hi,

good package. Thanks for work.
I have a problem with surveytoolbox::varl_tb, it occurs when one of label is a number.
It is then silently converted to numeric, and cannot be coerced to character. 
I would recommend adding extra ifelse. Something like ifelse(is.numeric(.), as.character(.), .).
Should work fine then.

Best 
Seweryn

