| bytes | Package bytes implements functions for the manipulation of byte slices. |
| errors | Package errors implements functions to manipulate errors. |
| golang.org/x/image/font | Package font defines an interface for font faces, for drawing text on an image. |
| golang.org/x/image/math/fixed | Package fixed implements fixed-point integer types. |
| io | Package io provides basic interfaces to I/O primitives. |
| 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. |