Iterate the sheets

I would like to iterate all the sheets in a workbook.
something like:

for sheet in workbook.sheets:
  .... do something....

the workbook has a sheets seq, but it is not marked 'public'

  XlWorkbook* = ref object
    ## Represent a workbook.
    contents: Table[string, XlObject]
    sheets: seq[XlSheet]

Is there any reason why the property sheets in XlWorkbook is private? Or may I just change that (and create a 'pr')?
Thx

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