By default, reqwest uses openssl for TLS. Any consumer wanting to use
rustls will thus pull in unnecessary dependencies. To make getting started
with bdk and reqwest easier, we add a `reqwest-default-tls` feature
that can be used to activate reqwest's `default-tls` feature. TLS is
necessary for the esplora integration. Adding this feature makes it possible
for people to use bdk with esplora without adding a reqwest dependency to
their manifest.
This allows `FeeRate`s to be stored inside `const`s.
For example:
const MY_FEE_RATE: FeeRate = FeeRate::from_sat_per_vb(10.0);
Unfortunately, floating point maths inside const expressions is
still unstable, hence we cannot make `from_btc_per_kvb` const.
Thomas Eizinger