Address review comments

- doc: do not use Unicode multiplication sign
- doc: fix incorrect parameter name
- zlib: remove `instanceof Buffer`
- zlib: stylistic change
- test: remove unneeded array spread
- test: stylistic change

doc/api/zlib.md

@@ -295,7 +295,7 @@ ignored by the decompression classes.
 
 * `flush` {integer} (default: `zlib.constants.Z_NO_FLUSH`)
 * `finishFlush` {integer} (default: `zlib.constants.Z_FINISH`)
-* `chunkSize` {integer} (default: 16 × 1024)
+* `chunkSize` {integer} (default: 16\*1024)
 * `windowBits` {integer}
 * `level` {integer} (compression only)
 * `memLevel` {integer} (compression only)
@@ -627,7 +627,7 @@ changes:
     description: The `buffer` parameter can be an Uint8Array now.
 -->
 
-- `buf` {Buffer|Uint8Array|string}
+- `buffer` {Buffer|Uint8Array|string}
 
 Decompress a chunk of data with [Unzip][].
 

lib/zlib.js

@@ -82,9 +82,9 @@ function zlibBuffer(engine, buffer, callback) {
   // Streams do not support non-Buffer Uint8Arrays yet. Convert it to a
   // Buffer without copying.
   if (isUint8Array(buffer) &&
-      !(Object.getPrototypeOf(buffer) === Buffer.prototype ||
-        buffer instanceof Buffer))
+      Object.getPrototypeOf(buffer) !== Buffer.prototype) {
     buffer = Buffer.from(buffer.buffer, buffer.byteOffset, buffer.byteLength);
+  }
 
   var buffers = [];
   var nread = 0;

test/parallel/test-zlib-convenience-methods.js

@@ -28,7 +28,7 @@ const zlib = require('zlib');
 
 const expectStr = 'blahblahblahblahblahblah';
 const expectBuf = Buffer.from(expectStr);
-const expectUint8Array = new Uint8Array([...expectBuf]);
+const expectUint8Array = new Uint8Array(expectBuf);
 const opts = {
   level: 9,
   chunkSize: 1024,

test/parallel/test-zlib-dictionary.js

@@ -41,7 +41,7 @@ const spdyDict = Buffer.from([
   'ation/xhtmltext/plainpublicmax-agecharset=iso-8859-1utf-8gzipdeflateHTTP/1',
   '.1statusversionurl\0'
 ].join(''));
-const spdyDictUint8Array = new Uint8Array([...spdyDict]);
+const spdyDictUint8Array = new Uint8Array(spdyDict);
 
 const input = [
   'HTTP/1.1 200 Ok',

test/parallel/test-zlib-not-string-or-buffer.js

@@ -8,7 +8,7 @@ const assert = require('assert');
 const zlib = require('zlib');
 
 const expected =
-  /^TypeError: "buffer" argument must be a string, Buffer, or Uint8Array$/;
+    /^TypeError: "buffer" argument must be a string, Buffer, or Uint8Array$/;
 
 assert.throws(() => { zlib.deflateSync(undefined); }, expected);
 assert.throws(() => { zlib.deflateSync(null); }, expected);