StorageInterface::hasItem issue with ext-redis 4.0.1+

[boesing]

I am actually working on zend-cache v3 and therefore a zend-cache-redis extension, where I am running into unit test errors.

I narrowed the issue down to ext-redis which introduced a huge bc break in a minor release.
Starting with ext-redis v4.0.1, they changed the return value of exists from boolean to integer.

I've created an issue phpredis/phpredis#1401 to see what can be done.
However, actually, zend-cache is not working with ext-redis 4.0.1+ (at least if someone uses strict type checks).

I just wanted you guys to be on track with that issue.
Not sure if we should provide a patch for those versions until they fix that issue?

Code to reproduce the issue

Just execute unit tests on local machine with ext-redis 4.0.1+.

Expected results

StorageInterface::hasItem returns boolean

Actual results

StorageInterface::hasItem returns integer

[boesing]

Never mind, the project I've forked had old code.