Add some details to "why has" to address #3

README.md

@@ -126,7 +126,19 @@ A polyfill of `Object.has()` is available in [polyfill.js](./polyfill.js).
 
 ### Why the name `has`?
 
-`has` is a popular name for this function in user-land library code ([See Related](#related)).
+`has` is a popular name for this function in user-land library code ([See Related](#related)). It also has clear parallels to the use of methods named `entries()`:
+
+```js
+Object.entries(o) // "own" properties
+Map.prototype.entries()
+Set.prototype.entries()
+FormData.prototype.entries()
+
+Object.has(o, p) // "own" properties
+Map.prototype.has(p)
+Set.prototype.has(p)
+FormData.prototype.has(p)
+```
 
 Alternative Options: `hasOwn`