diff --git a/core/encoding/json/marshal.odin b/core/encoding/json/marshal.odin
index 34ac71fca..d25758275 100644
--- a/core/encoding/json/marshal.odin
+++ b/core/encoding/json/marshal.odin
@@ -1,6 +1,7 @@
 package json
 
 import "core:mem"
+import "core:bits"
 import "core:runtime"
 import "core:strconv"
 import "core:strings"
@@ -20,7 +21,10 @@ marshal :: proc(v: any, allocator := context.allocator) -> ([]byte, Marshal_Erro
 		strings.destroy_builder(&b);
 		return nil, err;
 	}
-
+	if len(b.buf) == 0 {
+		strings.destroy_builder(&b);
+		return nil, err;
+	}
 	return b.buf[:], err;
 }
 
@@ -242,7 +246,7 @@ marshal_arg :: proc(b: ^strings.Builder, v: any) -> Marshal_Error {
 		}
 
 	case Type_Info_Enum:
-		return Marshal_Error.Unsupported_Type;
+		return marshal_arg(b, any{v.data, info.base.id});
 
 	case Type_Info_Bit_Field:
 		data: u64 = 0;
@@ -273,6 +277,50 @@ marshal_arg :: proc(b: ^strings.Builder, v: any) -> Marshal_Error {
 		write_byte(b, '}');
 
 	case Type_Info_Bit_Set:
+		is_bit_set_different_endian_to_platform :: proc(ti: ^runtime.Type_Info) -> bool {
+			if ti == nil {
+				return false;
+			}
+			ti = runtime.type_info_base(ti);
+			switch info in ti.variant {
+			case runtime.Type_Info_Integer:
+				using runtime.Type_Info_Endianness;
+				switch info.endianness {
+				case Platform: return false;
+				case Little:   return ODIN_ENDIAN != "little";
+				case Big:      return ODIN_ENDIAN != "big";
+				}
+			}
+			return false;
+		}
+
+		bit_data: u64;
+		bit_size := u64(8*ti.size);
+
+		do_byte_swap := is_bit_set_different_endian_to_platform(info.underlying);
+
+		switch bit_size {
+		case  0: bit_data = 0;
+		case  8:
+			x := (^u8)(v.data)^;
+			bit_data = u64(x);
+		case 16:
+			x := (^u16)(v.data)^;
+			if do_byte_swap do x = bits.byte_swap(x);
+			bit_data = u64(x);
+		case 32:
+			x := (^u32)(v.data)^;
+			if do_byte_swap do x = bits.byte_swap(x);
+			bit_data = u64(x);
+		case 64:
+			x := (^u64)(v.data)^;
+			if do_byte_swap do x = bits.byte_swap(x);
+			bit_data = u64(x);
+		case: panic("unknown bit_size size");
+		}
+		write_u64(b, bit_data);
+
+
 		return Marshal_Error.Unsupported_Type;
 
 	case Type_Info_Opaque:
diff --git a/core/encoding/json/parser.odin b/core/encoding/json/parser.odin
index aa041ba5e..374f8589f 100644
--- a/core/encoding/json/parser.odin
+++ b/core/encoding/json/parser.odin
@@ -11,7 +11,7 @@ Parser :: struct {
 	allocator:  mem.Allocator,
 }
 
-make_parser :: proc(data: string, spec := Specification.JSON, allocator := context.allocator) -> Parser {
+make_parser :: proc(data: []byte, spec := Specification.JSON, allocator := context.allocator) -> Parser {
 	p: Parser;
 	p.tok = make_tokenizer(data, spec);
 	p.spec = spec;
@@ -21,7 +21,7 @@ make_parser :: proc(data: string, spec := Specification.JSON, allocator := conte
 	return p;
 }
 
-parse :: proc(data: string, spec := Specification.JSON, allocator := context.allocator) -> (Value, Error) {
+parse :: proc(data: []byte, spec := Specification.JSON, allocator := context.allocator) -> (Value, Error) {
 	context.allocator = allocator;
 	p := make_parser(data, spec, allocator);
 
diff --git a/core/encoding/json/tokenizer.odin b/core/encoding/json/tokenizer.odin
index 3cada4b45..dd1704ba7 100644
--- a/core/encoding/json/tokenizer.odin
+++ b/core/encoding/json/tokenizer.odin
@@ -35,17 +35,17 @@ Kind :: enum {
 }
 
 Tokenizer :: struct {
-	using pos: Pos,
-	data: string,
-	r: rune, // current rune
-	w: int,  // current rune width in bytes
+	using pos:        Pos,
+	data:             []byte,
+	r:                rune, // current rune
+	w:                int,  // current rune width in bytes
 	curr_line_offset: int,
-	spec: Specification,
+	spec:             Specification,
 }
 
 
 
-make_tokenizer :: proc(data: string, spec := Specification.JSON) -> Tokenizer {
+make_tokenizer :: proc(data: []byte, spec := Specification.JSON) -> Tokenizer {
 	t := Tokenizer{pos = {line=1}, data = data, spec = spec};
 	next_rune(&t);
 	if t.r == utf8.RUNE_BOM {
@@ -59,7 +59,7 @@ next_rune :: proc(t: ^Tokenizer) -> rune #no_bounds_check {
 		return utf8.RUNE_EOF;
 	}
 	t.offset += t.w;
-	t.r, t.w = utf8.decode_rune_in_string(t.data[t.offset:]);
+	t.r, t.w = utf8.decode_rune(t.data[t.offset:]);
 	t.pos.column = t.offset - t.curr_line_offset;
 	return t.r;
 }
@@ -174,7 +174,7 @@ get_token :: proc(t: ^Tokenizer) -> (token: Token, err: Error) {
 
 		skip_alphanum(t);
 
-		switch str := t.data[token.offset:t.offset]; str {
+		switch str := string(t.data[token.offset:t.offset]); str {
 		case "null":  token.kind = Kind.Null;
 		case "false": token.kind = Kind.False;
 		case "true":  token.kind = Kind.True;
@@ -204,7 +204,7 @@ get_token :: proc(t: ^Tokenizer) -> (token: Token, err: Error) {
 				if t.r == 'I' || t.r == 'N' {
 					skip_alphanum(t);
 				}
-				switch t.data[token.offset:t.offset] {
+				switch string(t.data[token.offset:t.offset]) {
 				case "-Infinity": token.kind = Kind.Infinity;
 				case "-NaN":      token.kind = Kind.NaN;
 				}
@@ -224,7 +224,7 @@ get_token :: proc(t: ^Tokenizer) -> (token: Token, err: Error) {
 				}
 				skip_digits(t);
 			}
-			str := t.data[token.offset:t.offset];
+			str := string(t.data[token.offset:t.offset]);
 			if !is_valid_number(str, t.spec) {
 				err = Error.Invalid_Number;
 			}
@@ -254,7 +254,7 @@ get_token :: proc(t: ^Tokenizer) -> (token: Token, err: Error) {
 			skip_digits(t);
 		}
 
-		str := t.data[token.offset:t.offset];
+		str := string(t.data[token.offset:t.offset]);
 		if !is_valid_number(str, t.spec) {
 			err = Error.Invalid_Number;
 		}
@@ -284,7 +284,8 @@ get_token :: proc(t: ^Tokenizer) -> (token: Token, err: Error) {
 			}
 		}
 
-		if !is_valid_string_literal(t.data[token.offset : t.offset], t.spec) {
+		str := string(t.data[token.offset : t.offset]);
+		if !is_valid_string_literal(str, t.spec) {
 			err = Error.Invalid_String;
 		}
 
@@ -323,7 +324,7 @@ get_token :: proc(t: ^Tokenizer) -> (token: Token, err: Error) {
 	case: err = Error.Illegal_Character;
 	}
 
-	token.text = t.data[token.offset : t.offset];
+	token.text = string(t.data[token.offset : t.offset]);
 
 	return;
 }
diff --git a/core/encoding/json/validator.odin b/core/encoding/json/validator.odin
index 332716e24..17073f102 100644
--- a/core/encoding/json/validator.odin
+++ b/core/encoding/json/validator.odin
@@ -3,7 +3,7 @@ package json
 import "core:mem"
 
 // NOTE(bill): is_valid will not check for duplicate keys
-is_valid :: proc(data: string, spec := Specification.JSON) -> bool {
+is_valid :: proc(data: []byte, spec := Specification.JSON) -> bool {
 	p := make_parser(data, spec, mem.nil_allocator());
 	if p.spec == Specification.JSON5 {
 		return validate_value(&p);
diff --git a/core/fmt/fmt.odin b/core/fmt/fmt.odin
index 10d4eb2be..c4a535d77 100644
--- a/core/fmt/fmt.odin
+++ b/core/fmt/fmt.odin
@@ -739,7 +739,7 @@ enum_value_to_u64 :: proc(ev: runtime.Type_Info_Enum_Value) -> u64 {
 }
 
 fmt_bit_set :: proc(fi: ^Info, v: any, name: string = "") {
-	is_bit_set_different_endian_to_platform :: proc(ti: ^runtime.Type_Info, ) -> bool {
+	is_bit_set_different_endian_to_platform :: proc(ti: ^runtime.Type_Info) -> bool {
 		if ti == nil {
 			return false;
 		}