Hi Internals,

When test driving PHP-5.5 I ran into issues with a change of unpack behaviour. 
Archive_Tar which is used by pecl and pear (`pecl install`) uses unpack with 
the "a" format character. On 5.4 it strips trailing NUL bytes, on 5.5 it does 
not. There is a new "Z" format character that can be used to get the old 
behaviour. The point is, this change broke pecl, and will likely break many 
other things in existence.

Anthony has asked me to post to internals, so that you can re-visit the issue 
and perhaps consider not breaking BC.

If you decide that you want to keep the BC break, I will gladly submit a patch 
for Archive_Tar.

Thanks,

Igor
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