Cargo Features

[dependencies]
flexrc = { version = "0.1.0", default-features = false, features = ["std", "track_threads", "str_deref"] }
default = std

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

std default track_threads?
track_threads = std
str_deref

FlexRc has 4 features without comments.