feat: nil/null/empty/blank literals, resolves #102

src/drop/blank-drop.ts

@@ -0,0 +1,12 @@
+import { isNil, isString } from 'src/util/underscore'
+import { isDrop } from 'src/drop/idrop'
+import { EmptyDrop } from 'src/drop/empty-drop'
+
+export class BlankDrop extends EmptyDrop {
+  equals (value: any) {
+    if (value === false) return true
+    if (isNil(isDrop(value) ? value.value() : value)) return true
+    if (isString(value)) return /^\s*$/.test(value)
+    return super.equals(value)
+  }
+}