headers()

Directs certain functions, such as any(), to search in the headers. variables() has the same function, but directing the search to the variables.

This function can also do an existance test, but that capability has been replaced by header_name() and header_index().

Data signatures
headers( [depreciated arg: $${\color{green}str}$$ ǁ $${\color{green}int}$$] )

Call signatures
headers( [depreciated arg: Term ǁ Variable ǁ Function] )

Purpose	Value
Main focus	headers() is a side-effect

Context	Qualifier
Match qualifiers	onmatch
Value qualifiers	onmatch

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