assertthat 0.2.1

• assert_that() no longer throws a fatal error on very long custom
  expressions (@jameslamb, #45)

• has_name() now always returns a single TRUE/FALSE, even if you use it
  to check multiple names (@jameslamb, #60)

• is.count() returns FALSE for NA_real_, NaN and NA_integer_.
  is.integerish() returns FALSE for NA_real_ and NaN (@drkarthi, #54)

• is.count(), is.flag(), is.number(), and is.scalar() now have
  well-defined behavior for Inf, -Inf, and finite but large numbers
  (@jameslamb, #47)