Pre-upgrade Check Version Specification Debate

Summary of what's been discussed.

The original requested way that it should work is illustrated in this example:

Original

<compatibility>

 <version>1.5</version>
 <version>2.5</version>
 <version>3.0.1</version>
 <version>4</version>

<compatibility>

Is interpretted as: Joomla 1.5: compatible Joomla 1.6: not compatible Joomla 1.7: not compatible Joomla 2.5: compatible Joomla 3.0: compatible for 3.0.1 and up in the 3.0 version Joomla 3.1: not compatible Joomla 3.2: not compatible Joomla 3.5: not compatible Joomla 4:0: compatible Joomla 4.1: compatible Joomla 4.2: compatible Joomla 4.5: compatible

End of Original

It was accidentally coded as:

Accidentally coded as

<compatibility>

 <version>1.5</version>
 <version>2.5</version>
 <version>3.0.1</version>
 <version>4</version>

<compatibility>

Is interpretted as: Joomla 1.5: compatible Joomla 1.6: not compatible Joomla 1.7: not compatible Joomla 2.5: compatible Joomla 3.0: compatible only for 3.0.1 Joomla 3.1: not compatible Joomla 3.2: not compatible Joomla 3.5: not compatible Joomla 4:0: compatible Joomla 4.1: compatible Joomla 4.2: compatible Joomla 4.5: compatible

end of Accidentally coded as

The above was changed to the original specifications, but some people continued to argue whether "3.0.1" should mean "compatible for 3.0.1 through 3.0.x" or "only for 3.0.1".

Others thought, we shouldn't use either of the above, but should use: http://getcomposer.org/doc/01-basic-usage.md#package-versions

99%-100% of the code is written for the original implementation. The getcomposer approach is not written.