Regression in Int#times unable to apply it over union of ints

[bcardiff]

a = 2i32
b = 5i64

c = rand > 0.5 ? a : b

c.times do 
  puts "x"
end

0.18.0 / 0.18.2 does not compile https://play.crystal-lang.org/#/r/1264, https://play.crystal-lang.org/#/r/1262
0.17.4 runs as expected https://play.crystal-lang.org/#/r/1263

[asterite]

Reduced:

struct Int
  def foo(&block : self ->)
    yield self
  end
end

(1 || 1_i64).foo do
end