To address the issue reported in rails/rails#7334 Oracle enhanced adapter can support reset_pk_sequence! as postgresql adapter does.
I'm working on this, Will open a pull request soon.
Didn't you already implement this in #83 ?
Right. You remember this old pull request I've implemented similar feature reset_sequence! in #83. I'm working on reset_pk_sequence! based on this, and found it needs some rework, such as supporting table_name argument sometimes Symbol or something.