Name arguments marked in --help-macros as boolean: true must either:
  • take no value and no = sign, in which case the value is implicitly set to 1
  • take value exactly 0 or 1
  • not be given, in which case a custom per-macro default is used. That value is the default from --help-macros, or 0 if such default is not given
For example, the \x full argument of cross references is correctly written as:
\x[boolean-argument]{full}
which renders as:
without the = sign, or equivalently:
\x[boolean-argument]{full=1}
which renders as:
The full=0 version is useful in the case of reference targets that unlike headers expand the title on the cross reference by default, e.g. images:
\x[boolean-argument]{full=1}
which renders as:
The name "boolean argument" is given by analogy to the "boolean attribute" concept in HTML5.

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