did you rewrite the funcion call?
this happens to me when I do that and forget to export the function.

Can we even call this a heap? Isn't this just an ordered list? A badly implemented one at that.
Why would you order the entire list everytime you insert a new object if you can assume that the list is already ordered to begin with?
How does this get Best Practices and Clever tags? And be top answer at that?

Tags are misplaced most of the time, so you can ignore them

OP solved it, closing

why is this tagged as Regular Expression?

Had the same problem.
The add, subtract and dot methods must raise errors.
The equals method must return only true or false even if the vectors have different sizes.

hehehee same.
and thinking while I was implementing my huge repetitive code with uninon
"there's no way there isn't a better way to solve this"

well, must be something else going on.
ran it again today and it passed all tests.
funny cause yesterday I ran it like 20 times and it was pretty consistent