`len` of Dictionaries handles repeated keys incorrectly

[faze-geek]

print(len({1: 2, 1: 3, 4: 5}))

(lp) faze-geek@DESKTOP-497JDCU:~/lpython/lpython$ ./src/bin/lpython try.py
3                  # Expected output is 2 since key 1 is repeated

[faze-geek]

This can be a part of a larger issue. Maybe repeated keys are dealt incorrectly for all operations. I came across this quite some time ago.