resolved issues raised by hhartle

src/render/boolean.ts

@@ -1,13 +1,12 @@
 import { Context } from '../context/context'
 
 export function isTruthy (val: any, ctx: Context): boolean {
-  if ((val === null) && ctx && ctx.opts && ctx.opts.jsTruthy ) return false;
   return !isFalsy(val, ctx)
 }
 
 export function isFalsy (val: any, ctx: Context): boolean {
-  if(ctx && ctx.opts && ctx.opts.jsTruthy) {
-    return val == false
+  if(ctx.opts.jsTruthy) {
+    return !val
   }
   else {
     return val === false || undefined === val || val === null

test/unit/render/boolean.ts

@@ -58,7 +58,7 @@ describe('boolean jsTruthy', async function () {
       expect(isTruthy(false, ctx)).to.be.false
     })
     it('null is always falsy', function () {
-      expect(isTruthy(null, ctx)).to.be.false
+      expect(isTruthy(null, ctx)).to.be.true
     })
     it('null is always falsy', function () {
       expect(isTruthy(null, ctx)).to.be.false