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Allow negative numbers
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@ -43,7 +43,7 @@ public class ArgumentNumber<T extends Number> extends Argument<T> {
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@Override
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public @NotNull T parse(CommandReader reader) throws ArgumentSyntaxException {
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final char start = reader.getNextChar();
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if (start < '0' || start > '9') throw new ArgumentSyntaxException("Numbers cannot start with", start+"", NOT_NUMBER_ERROR);
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if ((start < '0' || start > '9') && start != '-') throw new ArgumentSyntaxException("Numbers cannot start with", start+"", NOT_NUMBER_ERROR);
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final String input = reader.getWord();
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try {
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final T value;
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