Why is PDF_HUL_66 returned for two different cases?

[BertrandCaron]

I was trying to make sense of a PDF-hul-66 error and looked at

jhove/jhove-modules/pdf-hul/src/main/java/edu/harvard/hul/ois/jhove/module/pdf/Tokenizer.java

Line 321 in 53c8abe

throw new PdfMalformedException (MessageConstants.PDF_HUL_66, _offset);

Here, I see that PDF-hul-66 is returned in the case of a missing bracket (as stated in the error explanation) but also in case of an unexpected character in a float number.

I then supposed that "Lexical error" would be a generic error for all sorts of invalid content, but it seems that only in those two cases is the error returned. So I'm a bit confused...