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From: Adam Porter <adam@alphapapa.net>
Subject: Re: CUSTOM_ID vs ID
Date: Fri, 09 Aug 2019 06:12:43 -0500
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Nathan Neff <nathan.neff@gmail.com> writes:

> * Show the IDs (*and* headings :-) of recently created links (because you know,
> the IDs are hash codes (grumble grumble).  Currently Helm just shows the IDs :-(

Small pedantry: they're UUIDs, not hashes.  The distinction is
important, because UUIDs are generated randomly, while hashes are
derived from content.  In fact, nothing prevents UUIDs from being
duplicated except chance (and if you copy a tree, its ID becomes
duplicated in your Org files.)