Noissue - implement a couple of common lexical_cast cases.

test/compiled/String.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 134 matching lines @@
   EXPECT_EQ(123u, lexical_cast<uint32_t>(u"0123"_str));
   EXPECT_EQ(123u, lexical_cast<uint32_t>(u"0000123"_str));
   EXPECT_EQ(4294967294u, lexical_cast<uint32_t>(u"4294967294"_str));
   EXPECT_EQ(4294967295u, lexical_cast<uint32_t>(u"4294967295"_str));
   EXPECT_EQ(         0u, lexical_cast<uint32_t>(u"4294967296"_str));
   EXPECT_EQ(         0u, lexical_cast<uint32_t>(u"4594967295"_str));
   EXPECT_EQ(         0u, lexical_cast<uint32_t>(u"5294967295"_str));
   EXPECT_EQ(         0u, lexical_cast<uint32_t>(u"42949672950"_str));
   EXPECT_EQ(4294967295u, lexical_cast<uint32_t>(u"04294967295"_str));
 
-  EXPECT_EQ(123u, lexical_cast<uint32_t>(u"123abc"_str));
+  EXPECT_EQ(0, lexical_cast<int32_t>(u" 123"_str));
+  EXPECT_EQ(0u, lexical_cast<uint32_t>(u" 123"_str));
+  EXPECT_EQ(0, lexical_cast<int32_t>(u"123abc"_str));
+  EXPECT_EQ(0u, lexical_cast<uint32_t>(u"123abc"_str));
+  EXPECT_EQ(0, lexical_cast<int32_t>(u"1 23"_str));
+  EXPECT_EQ(0u, lexical_cast<uint32_t>(u"1 23"_str));
 }
 
 TEST(TestStringLexicalCast, toBoolean)
 {
   EXPECT_TRUE(lexical_cast<bool>(u"true"_str));
   EXPECT_FALSE(lexical_cast<bool>(u"true123"_str));
   EXPECT_FALSE(lexical_cast<bool>(u"false"_str));
   EXPECT_FALSE(lexical_cast<bool>(u"some-string"_str));
   EXPECT_FALSE(lexical_cast<bool>(u""_str));
   EXPECT_FALSE(lexical_cast<bool>(DependentString()));
 }
 
 TEST(TestStringLexicalCast, toOwnedString)
 {
   EXPECT_EQ(u"some-string"_str, lexical_cast<OwnedString>(u"some-string"_str));
   EXPECT_EQ(u""_str, lexical_cast<OwnedString>(u""_str));
 }