What problems are seen for the .compute(...) method exposed by the RHDG cache interface?

Issue

• If I use remoteCache.compute(key, (k,v)->{...}) this seems working but remoteCache.compute(key, (k,v)->{...}, timeToLive, TimeUnit.SECONDS) will throw an UnsupportedOperationException. What is the reason?

Caused by: java.lang.UnsupportedOperationException
    at org.infinispan.client.hotrod.impl.RemoteCacheSupport.compute(RemoteCacheSupport.java:212)

• The use of cache.compute(key, (k,v)->{...}, timeToLive, TimeUnit.SECONDS) will not work correctly if off-heap memory is configured. Without off-heap it will not throw Exceptions.

ERROR [org.infinispan.interceptors.impl.InvocationContextInterceptor] ISPN000136: Error executing command PrepareCommand on Cache 'wolfX', writing keys [test] java.lang.ClassCastException: java.lang.String cannot be cast to org.infinispan.commons.marshall.WrappedBytes
    at org.infinispan.container.offheap.OffHeapConcurrentMap.put(OffHeapConcurrentMap.java:83)
    ...
ERROR [org.infinispan.transaction.impl.TransactionCoordinator] ISPN000097: Error while processing a prepare in a single-phase transaction org.infinispan.commons.CacheException: java.lang.ClassCastException: java.lang.String cannot be cast to org.infinispan.commons.marshall.WrappedBytes
    at org.infinispan.interceptors.impl.InvocationContextInterceptor.rethrowException(InvocationContextInterceptor.java:134)
    ...
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.infinispan.commons.marshall.WrappedBytes
    at org.infinispan.container.offheap.OffHeapConcurrentMap.put(OffHeapConcurrentMap.java:83)
    ... 54 more
ERROR [org.infinispan.commons.tx.TransactionImpl] ISPN000926: afterCompletion() failed for SynchronizationAdapter{localTransaction=LocalTransaction{remoteLockedNodes=[lt-34411], isMarkedForRollback=false, lockedKeys=[], backupKeyLocks=[], topologyId=1, stateTransferFlag=null} org.infinispan.transaction.synchronization.SyncLocalTransaction@3} org.infinispan.transaction.synchronization.SynchronizationAdapter@22 org.infinispan.commons.CacheException: Could not commit.
    at org.infinispan.transaction.impl.TransactionTable.afterCompletion(TransactionTable.java:912)
    ...
Caused by: javax.transaction.xa.XAException
Caused by: org.infinispan.commons.CacheException: java.lang.ClassCastException: java.lang.String cannot be cast to org.infinispan.commons.marshall.WrappedBytes
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.infinispan.commons.marshall.WrappedBytes

• Using cache.compute(...) with expiration properties seems to not change the value, but did not throw any Exception. Is there a problem in my code?