Fix some of the parseFloat() tests I committed earlier, which were incorrect.
Fix some of the parseFloat() tests I committed earlier, which were incorrect.

jvasileff/ceylon.language,unratito/ceylon.language,ceylon/ceylon.language,unratito/ceylon.language,ceylon/ceylon.language,lucaswerkmeister/ceylon.language,lucaswerkmeister/ceylon.language,jvasileff/ceylon.language