The peekable class in more-itertools does not support generic type subscript syntax at runtime. Attempting…

The peekable class in more-itertools does not support generic type subscript syntax at runtime. Attempting…: a task in repo2rlenv-swe-gen (Harbor dataset). The fix should make peekable str return a proper types.GenericAlias object, matching the behavior of built-in types like list str and standard…