line_before()

Tracks the most recent value of a header to enable comparison with the current value.

Data signatures
line_before( header name: $${\color{green}str}$$ )
line_before( header: $${\color{green}Any}$$ )

Call signatures
line_before( header name: Term )
line_before( header: Header )

Purpose	Value
Main focus	line_before() produces a calculated value

Context	Qualifier
Match qualifiers	onmatch
Value qualifiers	onmatch
Name qualifier	optionally expected

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