Fixing bundled extension version mess

hi, We tried that many times but we fail to handle the version of bundled extensions. Along with some installer work and other integration (projects dependencies management, composer or other), we need to find a way to get rid of this problem. What do you think to simply use the PHP version number instead of some outdated (most of the time) version for all bundled extensions? For extensions being available both bundled or externally, the external versions will provide a sane version number when installed (like timezone db or other). Doing so will make requirements management much easier by adding a list of core extensions per PHP version. Thoughts? Cheers, -- Pierre @pierrejoye | http://www.libgd.org