1. nil : https://studygolang.com/articles/11535
2. keywords and identifiers in GO : https://go101.org/article/keywords-and-identifiers.html
3. Unicode Standard 8.0 : http://www.unicode.org/versions/Unicode8.0.0/
4. working files go: https://www.devdungeon.com/content/working-files-go#write_bytes or https://colobu.com/2016/10/12/go-file-operations/
5. Understanding Type in Go : https://studygolang.com/articles/13976?fr=sidebar or https://www.ardanlabs.com/blog/2013/07/understanding-type-in-go.html
6. The Go Programming Language Specification : https://golang.org/ref/spec#Types%E3%80%82
7. go语言中var :
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