Sanitization + better error reporting

src/utils.js

@@ -1,19 +1,7 @@
 const m = require('makerjs')
 
-exports.assert = (exp, msg) => {
-    if (!exp) {
-        throw new Error(msg)
-    }
-}
-
 exports.deepcopy = (value) => JSON.parse(JSON.stringify(value))
 
-exports.type = (val) => {
-    if (Array.isArray(val)) return 'array'
-    if (val === null) return 'null'
-    return typeof val
-}
-
 const eq = exports.eq = (a=[], b=[]) => {
     return a[0] === b[0] && a[1] === b[1]
 }