Cargo Features

data-rw = { version = "1.6.4", default-features = false, features = ["check_utf8", "rmp", "json", "data"] }
default = rmp

The rmp feature is set by default whenever data-rw is added without default-features = false somewhere in the dependency tree.

big_endian check_utf8
rmp default = rmp-serde
json = serde_json

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

rmp-serde rmp
serde_json json?