docs: comment about trimable chars

CHANGELOG.md

@@ -19,6 +19,7 @@ Please join and contribute:
 
 ## Trunk
 
+* docs: comment about trimable chars
 * refactor: move isCharTrimable
 
 ## Version 4.14.2

lib/es5/index.js

@@ -63,12 +63,18 @@ additional information.
 var _require = require('stream'),
     Transform = _require.Transform;
 
-var ResizeableBuffer = require('./ResizeableBuffer');
+var ResizeableBuffer = require('./ResizeableBuffer'); // white space characters
+// https://en.wikipedia.org/wiki/Whitespace_character
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Character_Classes#Types
+// \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff
+
 
 var tab = 9;
-var nl = 10;
+var nl = 10; // \n, 0x0A in hexadecimal, 10 in decimal
+
 var np = 12;
-var cr = 13;
+var cr = 13; // \r, 0x0D in hexadécimal, 13 in decimal
+
 var space = 32;
 var boms = {
   // Note, the following are equals:

lib/index.js

@@ -9,10 +9,14 @@ additional information.
 const { Transform } = require('stream')
 const ResizeableBuffer = require('./ResizeableBuffer')
 
+// white space characters
+// https://en.wikipedia.org/wiki/Whitespace_character
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Character_Classes#Types
+// \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff
 const tab = 9
-const nl = 10
+const nl = 10 // \n, 0x0A in hexadecimal, 10 in decimal
 const np = 12
-const cr = 13
+const cr = 13 // \r, 0x0D in hexadécimal, 13 in decimal
 const space = 32
 const boms = {
   // Note, the following are equals: