PG: Fixes issues comparing to zero or false (#4667)

* initial test

* more test

* clean up

* added correct errors

* test fix

* $eq null test

* type check

postinstall.js

@@ -1,7 +1,7 @@
 const pkg = require('./package.json');
 
-const version = parseFloat( process.version.substr(1) );
-const minimum = parseFloat( pkg.engines.node.match(/\d+/g).join('.') );
+const version = parseFloat(process.version.substr(1));
+const minimum = parseFloat(pkg.engines.node.match(/\d+/g).join('.'));
 
 module.exports = function () {
   const openCollective = `
@@ -47,4 +47,4 @@ module.exports = function () {
 
   process.stdout.write(errorMessage);
   process.exit(1);
-};
+};