add constructor default function parameters

[zhj135]

use default function parameters to remove !options

[NMFR]

Sorry for the super late reply, i have been struggling to find time to dedicate to this repo.

I do agree that your suggestion makes the code more readable, but it will break if someone passes null in the options value.

I will close this PR because of that, but if you come up with a change that handles that null problem and it improves readability i will gladly add it.

Thx for the help.