Commits on Jul 24, 2020

1. process_attestation: Validate epoch before using it …

   `data.target.epoch` is used to count the active validator set.
   
   Because `get_committee_count_per_slot` is extremely inefficient the way
   the spec is written, clients cache it, or the underlying active
   validator set.
   
   Performing the checks in the given order leads to a (very unlikely)
   security issue where the a cold and above all, distant value may get
   used which may be costly - reordering the checks brings the value into a
   more reasonable range before using it.

   

   arnetheduck committed Jul 24, 2020
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