
Factor level attributes of interlaced vectors
      Source: R/interlaced.R
      levels.interlacer_interlaced.RdThe base S3 levels() function is overloaded for interlaced vectors, so
when the value channel is a factor type, levels() will return its levels.
Similarly na_levels() will return the levels for the missing reason
channel.
Usage
# S3 method for class 'interlacer_interlaced'
levels(x)
na_levels(x)