Cargo Features

base64_type has no features set by default.

[dependencies]
base64_type = { version = "0.2.0", features = ["arbitrary"] }
arbitrary = proptest, proptest-derive

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.

proptest-derive arbitrary?
proptest arbitrary?