See commit message:
http://bazaar.launchpad.net/~percona-dev/percona-server/5.1.54/revision/179
bool variables in mysql can be used without argument in command-line and config.
Example:
--use_global_long_query_time
Variables what can be used without argument named "optional".
Bug #691234 provocated by "required" type of variable - as result,
--use_global_long_query_time --log_slow_verbosity="full"
interpreted as:
use_global_long_query_time="--log_slow_berbosity=\"full\""
as effect:
use_global_long_query_time=0 and log_slow_verbosity not setuped
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Now similar trouble for enable_query_response_time (patch query_cache_enhance).
For fix this bugs we should:
1) Found all boolean variables in our patches
2) Create test-cases for it
3) Fix all found bugs
Already released, covered by tests