TriGParser/N3Lexer fails when certain control / Unicode characters appear in string (e.g. \xEF\xBB\xBF)

[k00ni]

TriGParser / N3Lexer runs into an exception if a file contains certain control or Unicode characters. I couldn't find a way to display these characters in an editor (VSCode, gedit,...), so when you open it, don't wonder that there are no such characters before @prefix statements.

The stack trace is:

Fatal error: Uncaught Exception: Unexpected "@prefix" on line 1. 
in /govi/scripts/vendor/pietercolpaert/hardf/src/N3Lexer.php:456

Stack trace:
#0 /..-/hardf/src/N3Lexer.php(109): pietercolpaert\hardf\N3Lexer->syntaxError('\xEF\xBB\xBF@prefix', 1)
#1 /.../hardf/src/N3Lexer.php(408): pietercolpaert\hardf\N3Lexer->pietercolpaert\hardf\{closure}(Object(pietercolpaert\hardf\N3Lexer))
#2 /.../hardf/src/N3Lexer.php(470): pietercolpaert\hardf\N3Lexer->tokenizeToEnd(Object(Closure), false)
#3 /.../hardf/src/N3Lexer.php(491): pietercolpaert\hardf\N3Lexer->pietercolpaert\hardf\{closure}('\xEF\xBB\xBF@prefix owl:...', false)
#4 /.../hardf/src/TriGParser.php(1183): pietercolpaert\hardf\N3Lexer->tokenize('\xEF\xBB\xBF@prefix owl:...', false)

#5 /govi/scripts/vendor/sweetrdf/quick-rdf-io/src/quickRdfIo/TriGParser.php(159): 
    pietercolpaert\hardf\TriGParser->parseChunk('\xEF\xBB\xBF@prefix owl:...')

(note: quickRdfIo was used)

Here is a prepared failing test:

https://github.com/pietercolpaert/hardf/blob/bug/parser-fails-control-or-unicode-characters/test/TriGParserTest.php#L2110-L2113

And here is the related N3 file:

https://lov.linkeddata.es/dataset/lov/vocabs/identity/versions/2014-04-03.n3