- use value plucking
- remove helpers not needed now
- types in OPS_* are now returned by *Operator
- RESERVED_WORDS is now a `Object<Identifier,true>`
- use ES2015+ JavaScript
- cleanup source code
The PEG.js version is exported and also written into the generated parser. In both these instances the version is a separate string, which means every time the version is bumped, it has to be changed in 3 places. This commit makes it slightly less of a maintenance burden.