boolean()

boolean() is a line() schema type representing a bool value.

To generate a particular bool value use yes() or no().

As you would think, setting distinct limits the number of lines to four, for practical purposes. Namely: yes(), no(), none(), and a header name.

Data signatures
boolean( value: $${\color{green}None}$$ ǁ $${\color{green}bool}$$ ǁ $${\color{green}str}$$ )

Call signatures
boolean( value: Term ǁ Variable ǁ Header ǁ Function )

Purpose	Value
Main focus	boolean() produces a calculated value and decides matches
Type	Boolean is a line() schema type

Context	Qualifier
Match qualifiers	onmatch, distinct
Value qualifiers	onmatch, notnone

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