Improve type checking for Orchestra\Memory\Abstractable\Container::attached() and fixes docblock.

Signed-off-by: crynobone <crynobone@gmail.com>
Update changelog.

Signed-off-by: crynobone <crynobone@gmail.com>
Avoid generating checksum from serializing an already serialized string.

Signed-off-by: crynobone <crynobone@gmail.com>
Slightly improve the syntax, and reduce redundant process.

Signed-off-by: crynobone <crynobone@gmail.com>
Avoid using continue in foreach.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1'