Type hint toArray to fix JDK11 compatibility

[willcohen]

On JDK11, toArray needs to be hinted (see openjdk change).

See CRRBV-18 for the core.rrb-vector fix, and CLJ-2374 for the same issue in clojure.

[willcohen]

@amalloy re-noting this issue now that JDK 11 is released

[ghadishayban]

type hint can be ^objects in both places -- as it is upstream in Clojure.

Agreed that this needs a hotfix for JDK11.

[willcohen]

PR is now modified to use ^objects

[danielsz]

Got bitten after upgrading to JDK11..

[magnars]

Yes, for us it is the ring-middleware-format package that relies on circleci/clj-yaml which in turn uses flatland/ordered that fails when upgrading to JDK11. Any chance you could take a look at this, @amalloy?

[ghaskins]

+1 for this fix

[mikeThurmond]

@amalloy I'm going to chime in here and hope that the owner/person with write access will merge this or create a hotfix for java11. Thanks!

[danielcompton]

This is now available in [org.flatland/ordered "1.5.7"].