* Resolve Phpstan Messages - FINALE - Shared/OLE
Reduce number of Phpstan messages by addressing their issues. This is the last of a series of related tickets to achieve that end. Only a handful of messages will be left in Phpstan baseline after this change is merged.
Shared/Ole.php and Shared/Ole/ChainedBlockStream.php were completely uncovered in the test suite. So I wrote some tests and found they didn't work at all. There were 2 problems. The first was that ChainedBlockStream checks for a mode of `r`, but Ole invokes it with mode `rb`. ChainedBlockStream will now just check the first character of the mode.
The second was a more interesting problem. Ole was reading "an *unsigned* long". However, what it should have been reading was "a 32-bit *signed* long". The irony of this mismatch is that, once the mode problem was corrected, 32-bit Php handled Ole and ChainedBlockStream correctly, but 64-bit Php did not. The code is corrected to work properly for both 32- and 64-bit.
* Scrutinizer
2 dead assignments - sufficient to just make calls which are expected to fail.
oleibman