OK to merge it.
Only a comment related to the example in the PR description, just in case new comers end up seeing it in the future - respectively about:
``` mod_param("xlog", "prefix", "$_s([$(cfg(file):$cfg(line)] $ci $(cfg(route){s.tolower}) )") ```
The $_s() should not be needed, the modparam is going to end up with a string value anyhow based on the C code anyhow. The example in README is ok.