subarray does not work when resulting object has dimension 1

[johnrbryant]

coef_true
An object of class "Values"

name: coef iteration
length: 1 20
dimtype: state iteration
dimscale: Categories Iterations
first: pakeha 1
last: pakeha 20

    iteration

coef 1 2 3 4 5 6
pakeha 0.1674845 -0.1461451 0.1199069 -0.01387402 -0.08265017 -0.05510805
iteration
coef 7 8 9 10 11 12
pakeha -0.09195239 0.163945 -0.02232231 -0.01755576 -0.1442953 0.06181244
iteration
coef 13 14 15 16 17 18
pakeha 0.1553897 -0.003024108 -0.0689705 -0.05937134 -0.05924878 0.1449518
iteration
coef 19 20
pakeha -0.01812398 -0.02259441

subarray(coef_true, iteration == 1)
Error in validObject(.Object) :
invalid class “MetaData” object: must have at least 1 dimension