Error handling with Go Readers/Writers

Readers and Writers in Golang have interesting error behavior. Generally, any read/write operations will return an int count of how many pieces of data (usually bytes) were read into a slice. If that count is less than expected, an error will also be returned. These errors don't mean a permanent failure to read, so they can't just fail out of a function.

I was unable to find resources on handling these errors, and would love some help if someone is more knowledgeable about those particular operations.