Which are barely "compute", but very nice for redirect-rewrite-add-headers type stuff. Like mruby in h2o, lua/js in various nginx modules and so on. Their JS e

Which are barely "compute", but very nice for redirect-rewrite-add-headers type stuff. Like mruby in h2o, lua/js in various nginx modules and so on. Their JS engine seems quite odd, they selectively have very modern features but not let/const o_0