More towards major internal rewrite:

* Add support for 'globals = NULL'

* Add hidden 'reset' argument to future() that is passed to evalFuture() for controlling what is undone in the workers R session upon completion, e.g. envvars, options, global variables, ...

* Add internal setNumberOfThreads(), which can currently control OpenMP and Rcpp. This code was previously scatter here an there

* Add 'future_uuid()', which avoid one call to uuid() -> digest::digest()

* Drop internal-only globals() and packages() S3 generics

* Restructuring some of the cluster future code

* Add hidden support for 'R_FUTURE_PRUNE_PKG_CODE'

Squashed commit of the following:

commit dfc852a
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Mon Feb 17 11:06:09 2025 -0800

    Fix bug in new setNumberOfThreads()

commit 7aec46f
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 22:33:56 2025 -0800

    Add setNumberOfThreads()

commit eb080be
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 20:50:56 2025 -0800

    Forgot to drop cleanup = TRUE in getExpression()

commit 068f6d0
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 20:46:12 2025 -0800

    Support globals = NULL

commit 360fda7
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 20:45:40 2025 -0800

    Prune also functions local to other functions

commit f682ede
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 20:06:09 2025 -0800

    Drop a few unneeded unique()

commit 73d88b6
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 19:37:34 2025 -0800

    evalFuture(): Replace logical 'cleanup' with character vector 'reset'

commit a296ac3
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 18:29:40 2025 -0800

    Add plan('tail')

commit 59ad59d
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 18:00:58 2025 -0800

    Fixes for conditions = NULL

commit 9b1dec3
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 17:26:33 2025 -0800

    CLEANUP: base::local() -> local()

commit 0f54b80
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 17:18:30 2025 -0800

    SPECIAL CASE: conditions = NULL (to be deprecated)

commit 870fc58
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 17:04:28 2025 -0800

    CLEANUP: future uuid:s are no longer relying on the 'digest' package

commit 65657be
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 16:29:48 2025 -0800

    Materialize option 'future.relay.immediate' as soon as future is created; avoids querying the option later. which makes it faster, but more importantly fixes the behavior upfront

commit b9e2307
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 16:28:02 2025 -0800

    make uuid() a tad more performant

commit b6907e6
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 15:16:48 2025 -0800

    More performance tweaks

commit 2d7d943
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 14:39:55 2025 -0800

    Add internal canForceSingleThreading() that memoizes the result

commit cd350bc
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 13:55:23 2025 -0800

    More performance improvements:

    Add internal getSysCalls() - create sysCalls() once per R session.
    Add with_assert() and option to prune it

commit 502686f
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 12:52:59 2025 -0800

    Update default plan from "future" to future::sequential - avoids some lookup code

commit a42f7a0
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 12:50:49 2025 -0800

    remove stray test code

commit 0007791
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 10:51:32 2025 -0800

    CLEANUP: Drop internal globals() and packages() generics

commit 6607b95
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 10:33:45 2025 -0800

    more, minor performance improvements

commit e9db64c
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 10:15:25 2025 -0800

    Slight performance improvement: future$foo -> future[["foo"]]

commit 262fc4e
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 09:41:33 2025 -0800

    Add support for 'R_FUTURE_PRUNE_PKG_CODE'

commit f226a8b
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sun Feb 16 08:54:35 2025 -0800

    tiny performance improvements

commit 6a70e0f
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sat Feb 15 23:58:32 2025 -0800

    Add attachPackages()

commit b29a8a6
Author: Henrik Bengtsson <henrik.bengtsson@gmail.com>
Date:   Sat Feb 15 20:40:09 2025 -0800

    First steps toward a FutureBackend class; emulating for ClusterFuture for now

Author: HenrikBengtsson

DESCRIPTION

@@ -1,5 +1,5 @@
 Package: future
-Version: 1.34.0-9134
+Version: 1.34.0-9140
 Title: Unified Parallel and Distributed Processing in R for Everyone
 Imports:
     digest,

NAMESPACE

@@ -17,7 +17,6 @@ S3method(getFutureBackendConfigs,ClusterFuture)
 S3method(getFutureBackendConfigs,Future)
 S3method(getFutureBackendConfigs,MulticoreFuture)
 S3method(getFutureBackendConfigs,UniprocessFuture)
-S3method(globals,Future)
 S3method(journal,Future)
 S3method(journal,FutureJournal)
 S3method(journal,FutureJournalCondition)
@@ -36,7 +35,6 @@ S3method(nbrOfWorkers,cluster)
 S3method(nbrOfWorkers,future)
 S3method(nbrOfWorkers,multiprocess)
 S3method(nbrOfWorkers,uniprocess)
-S3method(packages,Future)
 S3method(plot,Mandelbrot)
 S3method(print,Future)
 S3method(print,FutureCondition)
@@ -187,6 +185,7 @@ importFrom(utils,file_test)
 importFrom(utils,getS3method)
 importFrom(utils,globalVariables)
 importFrom(utils,head)
+importFrom(utils,installed.packages)
 importFrom(utils,object.size)
 importFrom(utils,packageVersion)
 importFrom(utils,sessionInfo)