[WIP] attempt to make sure streams are closed

[line-o]

Description:

This is work in progress as we have still a test failure in BinaryValueFromBinaryStringTest.cast_hexBinary_to_base64

Reference:

fixes #5345

Type of tests:

none added

[adamretter]

@line-o Just to warn you that this approach won't work, you need to first better understand the lifetime of how these streams are designed to be used.

[reinhapa]

@line-o Just to warn you that this approach won't work, you need to first better understand the lifetime of how these streams are designed to be used.

@adamretter I was tinkering with @line-o a bit on that specific part of the code without better knowledge (as the draft state also hopefully refelcts 😎)

Any insights and tips to approach the problems are welcome of course

[adamretter]

@reinhapa Sure, I did see the draft status. I just wanted to (a) help you guys not waste your time by heading in the wrong direction, and (b) not cause stability issues in other aspects of eXist-db by you heading in the wrong direction.