+Deflate/Inflate:
+ Inflating raw deflated data causes a re-initialization of the inflate
+stream where the corresponding window bits are modified to tell libz to
+not check for zlib header bytes. This is not preventable AFAICS.
+ Using an encoding stream filter on a stream you read from, will
+not work as expected in a PHP version lower than 5.1.3.
+
+Internals:
+ - our http_urlencode_hash() does not differentiate between prefixes
+ for numeric or string keys.