fixup! streams: remove unnecessary check

Author: aduh95

lib/internal/webstreams/util.js

@@ -54,12 +54,11 @@ const AsyncIterator = {
 
 function extractHighWaterMark(value, defaultHWM) {
   if (value === undefined) return defaultHWM;
-  value = +value;
-  if (typeof value !== 'number' ||
-      NumberIsNaN(value) ||
-      value < 0)
+  const coercedValue = +value;
+  if (NumberIsNaN(coercedValue) ||
+      coercedValue < 0)
     throw new ERR_INVALID_ARG_VALUE.RangeError('strategy.highWaterMark', value);
-  return value;
+  return coercedValue;
 }
 
 function extractSizeAlgorithm(size) {