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Test whether an object is an `xl_comment`
is_xl_comment(x)
`TRUE` if `x` inherits from `"xl_comment"`.
An object.
Other cell content: xl_cell_general(), xl_comment(), xl_formula(), xl_rich_run(), xl_rich_string()
xl_cell_general()
xl_comment()
xl_formula()
xl_rich_run()
xl_rich_string()