Cargo Features

[dependencies]
pg_str = { version = "0.2.1", default-features = false, features = ["pg13", "pg_test"] }
default = pg13

The pg13 feature is set by default whenever pg_str is added without default-features = false somewhere in the dependency tree.

pg13 default

Enables pg13 of pgx ^0.1.21 and pgx-tests ^0.1.21

pg_test

pg_str has 3 features without comments.