Well, it seems that Denys merged the changes before I have the time to respond to comments, but anyway:
I actually disliked the argument about "de-facto standard" on compression levels. I think scripts should not depend on the default compression level, and should instead specify it explicitly. The reason is that you can not guarantee the 'gzip' on one machine is the same implementation on another (there are implementations that use more extensive search, for example, 7-zip and zopfli), it is just a coincidence that BusyBox gzip uses an implementation that's compatible with the most popular (zlib, I think), but it shouldn't be "guaranteed", let alone becoming a "standard" on implementaion or on the default behaviors. I am not suggesting to change the patch now. I'm just mentioning that relying on default behavior of any program, for any script, is a bad idea in general. (E.g. Do specify -6 if your script expects it, even though it seems redundant, because user setting can always override the program defaults.)
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