Change string concatenation with boolean values

The value of the boolean is now concatenated using the "true" or
"false" instead of the conversion to integer (1 or 0).

src/language/node_processor/ConcatExpressionProcessor.hpp

@@ -16,11 +16,11 @@ class ConcatExpressionProcessor final : public INodeProcessor
   {
     if constexpr (std::is_same_v<B_DataT, std::string>) {
       return a + std::get<B_DataT>(b);
-    } else if constexpr (std::is_arithmetic_v<B_DataT>) {
+    } else if constexpr ((std::is_arithmetic_v<B_DataT>)and(not std::is_same_v<B_DataT, bool>)) {
       return a + std::to_string(std::get<B_DataT>(b));
     } else {
       std::ostringstream os;
-      os << a << b;
+      os << a << std::boolalpha << b;
       return os.str();
     }
   }

tests/test_ConcatExpressionProcessor.cpp

@@ -74,7 +74,8 @@ TEST_CASE("ConcatExpressionProcessor", "[language]")
 
   SECTION("string + B")
   {
-    CHECK_CONCAT_EXPRESSION_RESULT(R"(let s:string, s = "foo_"; s = s+true;)", "s", std::string{"foo_1"});
+    CHECK_CONCAT_EXPRESSION_RESULT(R"(let s:string, s = "foo_"; s = s+(2>1);)", "s", std::string{"foo_true"});
+    CHECK_CONCAT_EXPRESSION_RESULT(R"(let s:string, s = "foo_"; s = s+(1>2);)", "s", std::string{"foo_false"});
   }
 
   SECTION("string + R^1")