Would you to add the Catch-All parameter like in julienschmidt httprouter ?

Pattern: /src/*filepath

 /src/                     match
 /src/somefile.go          match
 /src/subdir/somefile.go   match

The ParticleType docs are unnecessarily confusing. They're well written, but I think the reliance on the atom analogy and trying to fit the constraint machine into that analogy may be part of what is creating the confusion. But there are also other word choices and capitalization choices that are causing problems as well (especially