Compression is irrelevant in comparison

src/ecdsa.js

@@ -292,7 +292,6 @@ var ECDSA = {
   calcPubKeyRecoveryParam: function (origPubKey, r, s, hash) {
     for (var i = 0; i < 4; i++) {
       var pubKey = ECDSA.recoverPubKey(r, s, hash, i)
-      pubKey.compressed = origPubKey.compressed
 
       if (pubKey.pub.equals(origPubKey.pub)) {
         return i

src/message.js

@@ -32,7 +32,7 @@ Message.signMessage = function (key, message) {
   var sig = key.sign(hash)
   var obj = ecdsa.parseSig(sig)
 
-  var i = ecdsa.calcPubKeyRecoveryParam(key.getPub(key.compressed), obj.r, obj.s, hash)
+  var i = ecdsa.calcPubKeyRecoveryParam(key.getPub(), obj.r, obj.s, hash)
 
   i += 27
   if (key.compressed) {