Explicitly document the behavior of a few core functions like every? on empty or 1-element colls

Description

For example, while it might seem obvious to some that (every? pred []) returns true, it would be nice to make it explicit in the doc string.

Environment

None

Status

Assignee

Unassigned

Reporter

Andy Fingerhut

Labels

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Approval

None

Patch

None

Affects versions

Priority

Minor
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