And there it is!
2019-07-10 - Release 3.29.0
Version 3.29.0 is a regularly scheduled maintenance release of SQLite containing miscellaneous performance and feature enhancements. See the change log for details.
Beginning with this release, the double-quoted string literal misfeature is deprecated. The misfeature is still enabled by default, for legacy compatibility, however developers are encouraged to disable it at compile-time using the -DSQLITE_DQS=0 option, or at run-time using the SQLITE_DBCONFIG_DQS_DML and SQLITE_DBCONFIG_DQS_DDL actions to the sqlite3_db_config() interface. This is especially true for double-quoted string literals in CREATE TABLE and CREATE INDEX statements, as those elements can cause unexpected problems following an ALTER TABLE. See ticket 9b78184be266fd70 for an example.