| encoding/base64 | Package base64 implements base64 encoding as specified by RFC 4648. |
| errors | Package errors implements functions to manipulate errors. |
| golang.org/x/text/encoding | Package encoding defines an interface for character encodings, such as Shift JIS and Windows 1252, that can convert to and from UTF-8. |
| golang.org/x/text/transform | Package transform provides reader and writer wrappers that transform the bytes passing through as well as various transformations. |
| unicode/utf16 | Package utf16 implements encoding and decoding of UTF-16 sequences. |
| unicode/utf8 | Package utf8 implements functions and constants to support text encoded in UTF-8. |