Any issues reported are greatly appreciated. Please consider opening an issue not only in case you have encountered a bug, but if anything (be it API, functionality, workflow, docs, ...) looks like it can be improved.
Please avoid "improve the code style" kind of pull requests; in particular
if block ends with a return statement, so drop this else and outdent its block
suggestion of golint should be ignored.
If you intend to work on anything non-trivial, please open an issue first, to discuss the design and implementation before writing any code.