Fix reflection warning

[CreativeQuantum]

Test results:

➜  loom git:(master) lein test

lein test loom.test.alg

lein test loom.test.alg-generic
{:result true, :num-tests 100, :seed 1703904013727, :test-var "dag-similarity-100"}

lein test loom.test.attr

lein test loom.test.derived

lein test loom.test.flow

lein test loom.test.graph

lein test loom.test.label

lein test loom.test.network-simplex

Ran 52 tests containing 439 assertions.
0 failures, 0 errors.
➜  loom git:(master)