Fix number formatting (#868)

src/data_classes/AttributeNumeric.gd

@@ -7,7 +7,7 @@ var _number := NAN
 func _sync() -> void:
 	if not _value.is_empty():
 		_number = text_to_num(_value)
-		_percentage = _value.strip_edges().ends_with("%")
+		_percentage = text_check_percentage(_value)
 
 func set_num(new_number: float) -> void:
 	_number = new_number
@@ -20,6 +20,13 @@ func is_percentage() -> bool:
 	return _percentage
 
 
+func format(text: String) -> String:
+	var num := text_to_num(text)
+	if text_check_percentage(text):
+		return num_to_text(num * 100.0) + "%"
+	else:
+		return num_to_text(num)
+
 func num_to_text(number: float) -> String:
 	return NumberParser.num_to_text(number, formatter)
 
@@ -30,3 +37,6 @@ static func text_to_num(text: String) -> float:
 	if text.ends_with("%"):
 		return text.to_float() / 100
 	return text.to_float()
+
+func text_check_percentage(text: String) -> bool:
+	return text.strip_edges().ends_with("%")

src/data_classes/NumberParser.gd

@@ -5,6 +5,9 @@ static func num_to_text(number: float, formatter: Formatter) -> String:
 	if not is_finite(number):
 		return ""
 
+	if number == -0.0:
+		number = absf(number)
+
 	if formatter.number_use_exponent_if_shorter and absf(number) >= 1000.0:
 		var ending_zeros := 0
 		while is_zero_approx(fmod(number, 10 ** (ending_zeros + 1))):
@@ -19,4 +22,5 @@ static func num_to_text(number: float, formatter: Formatter) -> String:
 			output = output.right(-1)
 		elif output.begins_with("-0"):
 			output = output.erase(1)
+
 	return output