00TODO

TODO:

top level substr function?
	use explode & slice? (& in Match.slice?)

top level 'const DEBUG'
	top level trace functions, avoid ``

figure out node.js/browser compatible module format!
	use Babel??? typescript??

XXX document in README.md:
	Var class

top level "replaceall" function? Pattern.replaceall??

Accept non-bool returns as truthy in PE_Func??  Only reject undefined??
cache ref_array in Pattern.ra?
transfer more PE documentation to spipat.js
make print_{nodes,dot} Pattern methods??
StackVar class?? only allow .set()?

reuse C++ tests!!!
indicate stack frame type in Stack_Entry?
reimplement stack using growable Array (push)
	would need to keep as negative values
	but grow MORE negative as items pushed!

NOTES:
NODE_ENV=production nodejs --prof 
nodejs --prof-process isolate......log