Make the key_bits multiple assertion a static_assert
Make the key_bits multiple assertion a static_assert

May as well have this fire at compile time.

bowlofstew/sv6,bowlofstew/sv6,bowlofstew/sv6,aclements/sv6,aclements/sv6,aclements/sv6,aclements/sv6,aclements/sv6,bowlofstew/sv6,bowlofstew/sv6