test fix

Author: ChrisRackauckas

test/measurements.jl

@@ -1,5 +1,5 @@
 using RecursiveArrayTools, Measurements, Test
 
 x = 1.0 ± 0.0
-@test recursive_unitless_bottom_eltype(x) isa Measurements.Measurement{Float64}
-@test recursive_unitless_eltype(x) isa Measurements.Measurement{Float64}
+@test recursive_unitless_bottom_eltype(x) === Measurements.Measurement{Float64}
+@test recursive_unitless_eltype(x) === Measurements.Measurement{Float64}