tapENABLE_TESTING is removed from checks, and feature enablement
is the sole method for activating features. Unit tests are updated
to enable required features in the construction of the Env.
Tickets are put on a feature switch instead of a build macro.
Classes and functions for handling data and
values associated with the Ripple protocol.
Serialized Objects
In ripple objects transmitted over the network must be
serialized into a canonical format. The prefix "ST" refers
to classes that deal with the serialized format of ripple
objects.
The term "Tx" or "tx" is an abbreviation for "Transaction",
a commonly occurring object type.
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