| bytes | Package bytes implements functions for the manipulation of byte slices. |
| cmd/internal/bio | Package bio implements common I/O abstractions used within the Go toolchain. |
| 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. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| io | Package io provides basic interfaces to I/O primitives. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |