Reject with a TypeError if atLeast is 0

Author: MattiasBuelens

index.bs

@@ -1449,6 +1449,8 @@ value: newViewOnSameMemory, done: true }</code> for closed streams. If the strea
     [=a promise rejected with=] a {{TypeError}} exception.
  1. Let |minimumFill| be undefined.
  1. If |options|["{{ReadableStreamBYOBReaderReadOptions/atLeast}}"] was given,
+  1. If |options|["{{ReadableStreamBYOBReaderReadOptions/atLeast}}"] is 0, return [=a promise
+     rejected with=] a {{TypeError}} exception.
   1. If |view| has a \[[TypedArrayName]] internal slot,
    1. If |options|["{{ReadableStreamBYOBReaderReadOptions/atLeast}}"] &gt; |view|.\[[ArrayLength]],
       return [=a promise rejected with=] a {{RangeError}} exception.

reference-implementation/lib/ReadableStreamBYOBReader-impl.js

@@ -24,6 +24,11 @@ class ReadableStreamBYOBReaderImpl {
 
     let minimumFill;
     if ('atLeast' in options) {
+      if (options.atLeast === 0) {
+        return promiseRejectedWith(
+          new TypeError('options.atLeast must be greater than 0')
+        );
+      }
       if (view.constructor !== DataView) {
         if (options.atLeast > view.length) {
           return promiseRejectedWith(