Summary: Depends on D19651. Ref T13197. The application now accepts either numeric or string values. However, for consistency and to reduce surprise in the future, migrate existing saved queries to use string values.
Test Plan: Saved some queries on `master` with numeric constants, ran the migration, saw string constants in the database and equivalent behavior in the UI.
Reviewers: amckinley
Reviewed By: amckinley
Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam
Maniphest Tasks: T13197
Differential Revision: https://secure.phabricator.com/D19652
