Returns true if actual is the same type of error as expected.

Convert the given error to a string, including the stack trace if available.

If the given error is a wrapper that contains a stacktrace, unwrap it and return the original, underlying error.

Wrap the given error in an Error type that contains the stack trace.

Wrap the given error in an Error type that contains the stack trace and has the given message prepended as part of the error message.