| encoding/base64 | Package base64 implements base64 encoding as specified by RFC 4648. |
| encoding/xml | Package xml implements a simple XML 1.0 parser that understands XML name spaces. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/aws/smithy-go/encoding | |
| io | Package io provides basic interfaces to I/O primitives. |
| math/big | Package big implements arbitrary-precision arithmetic (big numbers). |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| unicode/utf8 | Package utf8 implements functions and constants to support text encoded in UTF-8. |