I don't know why but this was not problem until I switched to Dancer2
which (or Config::Any) warned me during first runtime that YAML is
deprecated and I need to install YAML::XS.
Either the XS version or something in Dancer2 is more strict.
No big deal (yet?)...
Added workaround for Dancer Issue 909 (splat pollution)
It's not possible to allow arbitrary paramers if `params()` is used,
since in cases of route matching, this hash will always contain
key `splat`.
https://github.com/PerlDancer/Dancer/issues/909
Using `request->params('query')` leads to clean params reflecting query
in URL.