Have you looked at the Github issues? They are linked via the "issues" link on MetaCPAN and I assume that they'll also accept documentation improvements.

In reply to Re: Template Toolkit's EXPOSE_BLOCKS option seems not to be documented anywhere but the O'Reilly book—who should we tell? by Corion
in thread Template Toolkit's EXPOSE_BLOCKS option seems not to be documented anywhere but the O'Reilly book—who should we tell? by Cody Fendant

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