K. A. Buhr questions

K. A. Buhr answers

• Haskell stack, how to revert ambiguous module names found in multiple packages globally
• What happened to Haskell's EitherT?
• Mimic C usage in preexisting R package
• Overlapping instances when modifying extensible record
• Is there a van Laarhoven optic based on the Monad typeclass?
• When are the results of default methods in instances cached?
• Define variable in list comprehension format function
• How to elegantly create a list of optional values?
• How to reliably determine if a Handle is a terminal in Haskell?
• Is this type-class constraint necessary or redundant?