`spec_type_to_var_spec`: consider adding `format` when remove duplicates?

[kaz462]

Current spec_type_to_var_spec combines multiple rows into one when variable, length, label, type are the same, but formats are different, e.g., below two rows from Variables sheet are considered as one row, so one of the formats is dropped:

Order	Dataset	Variable	Label	Data Type	Length	Significant Digits	Format
28	ADPFT	PARAMCD	Parameter Code	Text	8		$PFT
22	ADAETTE	PARAMCD	Parameter Code	Text	8		$AETTE

var_spec:

variable	length	label	type	format	common
PARAMCD	8	Parameter Code	Text	$PFT	FALSE

Should format be considered when removing duplicates in spec_type_to_var_spec ?