In #588 we created merge driver in Bash for Linux/Mac and in PHP for Windows. On Windows, there is a significant difference between time required to merge without custom merge driver (9.5 seconds) and with custom merge driver in PHP (110 seconds) - see full results. Because of the difference, we should try to implement the driver in some language with smaller overhead.

The key issue is that we need an implementation we can compile to the native code for all platforms – without any tools on the user side. Thus, we probably cannot use languages like Python, Perl, etc.

We thought about C or C++ but neither of us is fluent in them. Thus, maybe Go or Lua will be better :)