* Use balancesLength and randaoMixesLength to save copy on read
* use a cheaper copy for BLS publickey.Copy()
* Merge branch 'master' into bls-better-copy
* Merge refs/heads/master into bls-better-copy
* Merge refs/heads/master into bls-better-copy
* Merge refs/heads/master into bls-better-copy
* Merge refs/heads/master into bls-better-copy
* Merge branch 'master' of github.com:prysmaticlabs/prysm into bls-better-copy
* quick test
* Merge refs/heads/master into bls-better-copy