Merge branch 'develop' of github.com:futureverse/future into develop

Author: HenrikBengtsson

NEWS.md

@@ -1,6 +1,10 @@
 # Version (development version)
 
- * ...
+## Bug Fixes
+
+ * The `cluster` backend failed when used with an `MPIcluster` as
+   created by `parallel::makeCluster(..., type = "MPI")`. This bug was
+   introduced in **future** (>= 1.40.0) [2025-04-10].
 
 
 # Version 1.67.0 [2025-07-29]

R/backend_api-11.ClusterFutureBackend-class.R

@@ -234,7 +234,6 @@ launchFuture.ClusterFutureBackend <- function(backend, future, ...) {
 
   ## Does the cluster node communicate with a connection?
   ## (if not, it's likely via MPI)
-  stop_if_not(inherits(node, c("SOCK0node", "SOCKnode")))
   con <- node[["con"]]
   future[["nodeHasConnection"]] <- !is.null(con)
 
@@ -1469,7 +1468,7 @@ getFutureBackendConfigs.ClusterFuture <- function(future, ..., debug = isTRUE(ge
 
   ## Does the cluster node communicate with a connection?
   ## (if not, it's via MPI)
-  if (!future[["nodeHasConnection"]]) return(list())
+  if (!isTRUE(future[["nodeHasConnection"]])) return(list())
 
   capture <- list(
     immediateConditionHandlers = list(