| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/open-policy-agent/opa/ast | Deprecated: This package is intended for older projects transitioning from OPA v0.x and will remain for the lifetime of OPA v1.x, but its use is not recommended. |
| github.com/open-policy-agent/opa/internal/edittree/bitvector | Package bitvector provides the implementation of a variable sized compact vector of bits which supports lookups, sets, appends, insertions, and deletions. |
| math/big | Package big implements arbitrary-precision arithmetic (big numbers). |
| sort | Package sort provides primitives for sorting slices and user-defined collections. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |