diff --git a/lib/lexer.js b/lib/lexer.js
index 687305df..5027bb38 100644
--- a/lib/lexer.js
+++ b/lib/lexer.js
@@ -157,12 +157,18 @@
     };
     // Matches numbers, including decimals, hex, and exponential notation.
     Lexer.prototype.number_token = function() {
-      var number;
+      var leading, number;
       if (!(number = this.match(NUMBER, 1))) {
         return false;
       }
-      this.token('NUMBER', number);
       this.i += number.length;
+      if (starts(number, (leading = '.') + leading)) {
+        while (starts(number, leading)) {
+          this.token(leading, leading);
+          number = number.substring(leading.length);
+        }
+      }
+      this.token('NUMBER', number);
       return true;
     };
     // Matches strings, including multi-line strings. Ensures that quotation marks
@@ -655,7 +661,7 @@
   JS_FORBIDDEN = JS_KEYWORDS.concat(RESERVED);
   // Token matching regexes.
   IDENTIFIER = /^([a-zA-Z\$_](\w|\$)*)/;
-  NUMBER = /^(\b((0(x|X)[0-9a-fA-F]+)|([0-9]+(\.[0-9]+)?(e[+\-]?[0-9]+)?)))\b/i;
+  NUMBER = /^(((\b0(x|X)[0-9a-fA-F]+)|(((\b[0-9]+(\.[0-9]+)?)|([\.]+[0-9]+))(e[+\-]?[0-9]+)?)))\b/i;
   HEREDOC = /^("{6}|'{6}|"{3}\n?([\s\S]*?)\n?([ \t]*)"{3}|'{3}\n?([\s\S]*?)\n?([ \t]*)'{3})/;
   INTERPOLATION = /^\$([a-zA-Z_@]\w*(\.\w+)*)/;
   OPERATOR = /^([+\*&|\/\-%=<>:!?]+)([ \t]*)/;
diff --git a/src/lexer.coffee b/src/lexer.coffee
index ef0e31a2..9c1fa075 100644
--- a/src/lexer.coffee
+++ b/src/lexer.coffee
@@ -106,8 +106,12 @@ exports.Lexer: class Lexer
   # Matches numbers, including decimals, hex, and exponential notation.
   number_token: ->
     return false unless number: @match NUMBER, 1
-    @token 'NUMBER', number
     @i: + number.length
+    if starts number, (leading: '.') + leading
+      while starts number, leading
+        @token leading, leading
+        number: number.substring leading.length
+    @token 'NUMBER', number
     true
 
   # Matches strings, including multi-line strings. Ensures that quotation marks
@@ -481,7 +485,7 @@ JS_FORBIDDEN: JS_KEYWORDS.concat RESERVED
 
 # Token matching regexes.
 IDENTIFIER    : /^([a-zA-Z\$_](\w|\$)*)/
-NUMBER        : /^(\b((0(x|X)[0-9a-fA-F]+)|([0-9]+(\.[0-9]+)?(e[+\-]?[0-9]+)?)))\b/i
+NUMBER        : /^(((\b0(x|X)[0-9a-fA-F]+)|(((\b[0-9]+(\.[0-9]+)?)|([\.]+[0-9]+))(e[+\-]?[0-9]+)?)))\b/i
 HEREDOC       : /^("{6}|'{6}|"{3}\n?([\s\S]*?)\n?([ \t]*)"{3}|'{3}\n?([\s\S]*?)\n?([ \t]*)'{3})/
 INTERPOLATION : /^\$([a-zA-Z_@]\w*(\.\w+)*)/
 OPERATOR      : /^([+\*&|\/\-%=<>:!?]+)([ \t]*)/
diff --git a/test/test_issues.coffee b/test/test_issues.coffee
index c85bda32..39c21cff 100644
--- a/test/test_issues.coffee
+++ b/test/test_issues.coffee
@@ -1,5 +1,17 @@
-class Issue380
+# Issue #380: problem with @ and instanceof
+class ClassName
   am_i: ->
-    @ instanceof Issue380
+    @ instanceof ClassName
 
-ok (new Issue380()).am_i()
+obj: new ClassName()
+ok obj.am_i()
+
+
+# Issue #383: Numbers that start with . not recognized
+value: .25 + .75
+ok value is 1
+value: 0.0 + -.25 - -.75 + 0.0
+ok value is 0.5
+
+deepEqual [0..10],  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+deepEqual [0...10], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]