| bytes | Package bytes implements functions for the manipulation of byte slices. |
| 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. |
| hash | Package hash provides interfaces for hash functions. |
| hash/crc32 | Package crc32 implements the 32-bit cyclic redundancy check, or CRC-32, checksum. |
| image | Package image implements a basic 2-D image library. |
| image/color | Package color implements a basic color library. |
| rsc.io/qr/coding | Package coding implements low-level QR coding details. |