- Fixed long-standing bug in Oracle dialect where bound parameter
names that started with numbers would not be quoted, as Oracle
doesn't like numerics in bound parameter names.
fixes #2138
- embedding an existing predicate into a new one only
seems to be used by test_oracle->test_coerce_to_unicode().  The
predicate here should treat as a lambda based on enabled_for_config.
not sure why this test is not failing on jenkins