diff --git a/Utilities/StrFmt.cpp b/Utilities/StrFmt.cpp
index 7618bb3aab..a3a5dff484 100644
--- a/Utilities/StrFmt.cpp
+++ b/Utilities/StrFmt.cpp
@@ -38,67 +38,67 @@ void fmt_class_string<std::vector<char>>::format(std::string& out, u64 arg)
 template<>
 void fmt_class_string<char>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%hhx", static_cast<char>(arg));
+	fmt::append(out, "%#hhx", static_cast<char>(arg));
 }
 
 template<>
 void fmt_class_string<uchar>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%hhx", static_cast<uchar>(arg));
+	fmt::append(out, "%#hhx", static_cast<uchar>(arg));
 }
 
 template<>
 void fmt_class_string<schar>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%hhx", static_cast<schar>(arg));
+	fmt::append(out, "%#hhx", static_cast<schar>(arg));
 }
 
 template<>
 void fmt_class_string<short>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%hx", static_cast<short>(arg));
+	fmt::append(out, "%#hx", static_cast<short>(arg));
 }
 
 template<>
 void fmt_class_string<ushort>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%hx", static_cast<ushort>(arg));
+	fmt::append(out, "%#hx", static_cast<ushort>(arg));
 }
 
 template<>
 void fmt_class_string<int>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%x", static_cast<int>(arg));
+	fmt::append(out, "%#x", static_cast<int>(arg));
 }
 
 template<>
 void fmt_class_string<uint>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%x", static_cast<uint>(arg));
+	fmt::append(out, "%#x", static_cast<uint>(arg));
 }
 
 template<>
 void fmt_class_string<long>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%lx", static_cast<long>(arg));
+	fmt::append(out, "%#lx", static_cast<long>(arg));
 }
 
 template<>
 void fmt_class_string<ulong>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%lx", static_cast<ulong>(arg));
+	fmt::append(out, "%#lx", static_cast<ulong>(arg));
 }
 
 template<>
 void fmt_class_string<llong>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%llx", static_cast<llong>(arg));
+	fmt::append(out, "%#llx", static_cast<llong>(arg));
 }
 
 template<>
 void fmt_class_string<ullong>::format(std::string& out, u64 arg)
 {
-	fmt::append(out, "0x%llx", static_cast<ullong>(arg));
+	fmt::append(out, "%#llx", static_cast<ullong>(arg));
 }
 
 template<>
@@ -116,7 +116,7 @@ void fmt_class_string<double>::format(std::string& out, u64 arg)
 template<>
 void fmt_class_string<bool>::format(std::string& out, u64 arg)
 {
-	out += arg ? "true" : "false"; // TODO?
+	out += arg ? "true" : "false";
 }
 
 template<>
@@ -166,24 +166,19 @@ struct fmt::cfmt_src
 		return out.size() - start;
 	}
 
-	// Returns type size (0 if unknown, pointer, assumed max)
+	// Returns type size (0 if unknown, pointer, unsigned, assumed max)
 	std::size_t type(std::size_t extra) const
 	{
 		// Hack: use known function pointers to determine type
 #define TYPE(type)\
 		if (sup[extra].fmt_string == &fmt_class_string<type>::format) return sizeof(type);
 
-		TYPE(char);
-		TYPE(schar);
-		TYPE(uchar);
-		TYPE(short);
-		TYPE(ushort);
 		TYPE(int);
-		TYPE(uint);
-		TYPE(long);
-		TYPE(ulong);
 		TYPE(llong);
-		TYPE(ullong);
+		TYPE(schar);
+		TYPE(short);
+		if (std::is_signed<char>::value) TYPE(char);
+		TYPE(long);
 
 #undef TYPE
 
diff --git a/Utilities/cfmt.h b/Utilities/cfmt.h
index 4480eb4460..6573b8faa8 100644
--- a/Utilities/cfmt.h
+++ b/Utilities/cfmt.h
@@ -340,15 +340,15 @@ std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
 			ctx.type = (u8)src.type(ctx.args);
 		}
 
-		// Sign-extended argument expected: no special conversion
+		// Sign-extended argument expected
 		const u64 val = src.template get<u64>(ctx.args);
-		const s64 sval = val;
+		const bool negative = ctx.type && static_cast<s64>(val) < 0;
 
 		const std::size_t start = out.size();
 
 		if (!ctx.dot || ctx.prec)
 		{
-			if (sval < 0)
+			if (negative)
 			{
 				out.push_back('-');
 			}
@@ -361,7 +361,7 @@ std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
 				out.push_back(' ');
 			}
 
-			write_decimal(sval < 0 ? 0 - val : val, ctx.prec);
+			write_decimal(negative ? 0 - val : val, ctx.prec);
 		}
 
 		const std::size_t size2 = out.size() - start;
@@ -371,7 +371,7 @@ std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
 			// Add padding if necessary
 			if (ctx.zeros && !ctx.left && !ctx.dot)
 			{
-				out.insert(out.begin() + start + (sval < 0 || ctx.sign || ctx.space), ctx.width - size2, '0');
+				out.insert(out.begin() + start + (negative || ctx.sign || ctx.space), ctx.width - size2, '0');
 			}
 			else
 			{
@@ -402,6 +402,7 @@ std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
 			ctx.type == 2 ? 0xffffull :
 			ctx.type == 4 ? 0xffffffffull : 0xffffffffffffffffull;
 
+		// Trunc sign-extended signed types
 		const u64 val = src.template get<u64>(ctx.args) & mask;
 
 		const std::size_t start = out.size();
@@ -452,6 +453,7 @@ std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
 			ctx.type == 2 ? 0xffffull :
 			ctx.type == 4 ? 0xffffffffull : 0xffffffffffffffffull;
 
+		// Trunc sign-extended signed types
 		const u64 val = src.template get<u64>(ctx.args) & mask;
 
 		const std::size_t start = out.size();
@@ -509,6 +511,7 @@ std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
 			ctx.type == 2 ? 0xffffull :
 			ctx.type == 4 ? 0xffffffffull : 0xffffffffffffffffull;
 
+		// Trunc sign-extended signed types
 		const u64 val = src.template get<u64>(ctx.args) & mask;
 
 		const std::size_t start = out.size();