| encoding/binary | Package binary implements simple translation between numbers and byte sequences and encoding and decoding of varints. |
| errors | Package errors implements functions to manipulate errors. |
| math/bits | Package bits implements bit counting and manipulation functions for the predeclared unsigned integer types. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |