In Go, error values are commonly checked against _______ to determine if they are non-nil.
- err
- error
- nil
- panic
In Go, error values are commonly checked against the error interface to determine if they are non-nil. The error interface is the built-in interface type in Go that represents an error condition. It is defined as type error interface { Error() string }, which means any type that implements a method Error() string satisfies the error interface.
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