Ref T1191. We currently use utf8 charsets in MySQL, which silently truncate characters outside of the basic multilingual plane (larger than U+FFFF) like "Musical G-Clef".
Add a method to detect that a string contains characters outside of this range, and thus that inserting it will silently truncate data.
Test Plan: Added and executed unit tests.
Reviewers: btrahan, arice
Reviewed By: arice
CC: chad, arice, aran
Maniphest Tasks: T1191
Differential Revision: https://secure.phabricator.com/D8310