The context must be a CKKS one. A CKKSMaster built over BFV or
BGV would work arithmetically but every sentence of its
documentation, and the class name a user reads in printed output,
would be wrong about which scheme is in use; exact-integer work
goes through make_threshold_master(), which is scheme-agnostic by
design and says so.
Value
a CKKSMaster.
