While attempting to write and read in text/turtle, it appears that the parser fails to parse a string like

<http://example.org/a> <http://example.org/number> 1.1E0.

while it succeeds with a lower case e :

<http://example.org/a> <http://example.org/number> 1.1e0.

Most likely due to this line :

It must be noted that the serialize function does output an uppercase E, meaning rdflib.js can't read its own turtle output when involving float literals.

Tested with latest published version (2.2.35)