Duplicate option defaults

[elijaharita]

There are currently 2 (3? (4?)) sources of truth for default options - the first is from some of the CLI flags which have default values, and the second is from the newOptions() function. There is also kind of a third source, which is in the comments above each WithXXX option function.

This excessive duplication of default values is a maintenance burden and a potential weird source of bugs. Ideally there should only be one place that default constants are defined.