| crypto/rand | Package rand implements a cryptographically secure random number generator. |
| internal/byteorder | Package byteorder provides functions for decoding and encoding little and big endian integer types from/to byte slices. |
| io | Package io provides basic interfaces to I/O primitives. |
| math/rand/v2 | Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| testing | Package testing provides support for automated testing of Go packages. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |