Do not pass arguments using default values to the Filter\fun function#89

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Nyholm merged 3 commits intophp-http:masterfrom

ste93cry:fix/issue-78

Jul 9, 2018

Commits on Dec 1, 2017

Do not use the arguments that were not specified intentionally by the user for the read/write filters
ste93cry
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Do not rely on the number of arguments passed to the FilteredStream class to initialize the stream filter
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Commits on Feb 14, 2018

Add unit tests
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