Also coerce "char" for lint messages
Also coerce "char" for lint messages

Summary: Ref T8921. See similar change in D13695. This expands the scope to also coerce `setChar()`.

Test Plan: `arc unit --everything`

Reviewers: btrahan

Subscribers: epriestley

Maniphest Tasks: T8921

Differential Revision: https://secure.phabricator.com/D13737

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