Ruby Rspec: Expect Element Type of an Array of Objects

I want to check that an array contains only objects of a specific class, let's say Float.

A working example at the moment:

it "tests array_to_test class of elements" do
  expect(array_to_test.count).to eq(2)
  expect(array_to_test[0]).to be_a(Float)
  expect(array_to_test[1]).to be_a(Float)
end

Is there a way to validate if the array_to_test contains only Float instances?

Sample non-working pseudocode:

it "tests array_to_test class of elements" do
  expect(array_to_test).to be_a(Array[Float])
end

Do not consider Ruby and Rspec version as a restriction.