diff --git a/lib/parse.js b/lib/parse.js
index bfda6eb0..556b1a64 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -59,6 +59,8 @@ var OPERATOR_CHARS = makePredicate(characters("+-*&%=<>!?|~^"));
 
 var RE_HEX_NUMBER = /^0x[0-9a-f]+$/i;
 var RE_OCT_NUMBER = /^0[0-7]+$/;
+var RE_BIN_NUMBER = /^0b[01]+$/;
+var RE_DEC_NUMBER = /^\d*\.?\d*(?:e[+-]?\d*(?:\d\.?|\.?\d)\d*)?$/i;
 
 var OPERATORS = makePredicate([
     "in",
@@ -181,9 +183,10 @@ function parse_js_number(num) {
         return parseInt(num.substr(2), 16);
     } else if (RE_OCT_NUMBER.test(num)) {
         return parseInt(num.substr(1), 8);
-    } else {
-        var val = parseFloat(num);
-        if (val == num) return val;
+    } else if (RE_BIN_NUMBER.test(num)) {
+        return parseInt(num.substr(2), 2);
+    } else if (RE_DEC_NUMBER.test(num)) {
+        return parseFloat(num);
     }
 };