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Native Promise accepted by types but not serializable at runtime

Status: Open.

#146 In cloudflare/capnweb;

· VastBlast opened on Mar 8, 2026

<code>exportStub()</code> always allocates a new export ID, even for duplicate capabilities

bugSomething isn't workingSomething isn't working

Status: Open.

#141 In cloudflare/capnweb;

· Dr-Emann opened on Feb 19, 2026

ImportTableEntry's remoteRefcount is only ever 1 or 0

bugSomething isn't workingSomething isn't working

Status: Open.

#140 In cloudflare/capnweb;

· Dr-Emann opened on Feb 19, 2026

Document that you must configure your TS "lib" to support Disposable

documentationImprovements or additions to documentationImprovements or additions to documentation

Status: Open.

#112 In cloudflare/capnweb;

· PizzaConsole opened on Nov 13, 2025

<code>ReadableStreams</code> and <code>Response</code> objects are not supported

enhancementNew feature or requestNew feature or request

largeMajor project, days or weeks of work.Major project, days or weeks of work.

Status: Open.

#93 In cloudflare/capnweb;

· dario-piotrowicz opened on Oct 29, 2025

Custom error details

enhancementNew feature or requestNew feature or request

Status: Open.

#87 In cloudflare/capnweb;

· burdiyan opened on Oct 20, 2025

[Feature] Add option to provide custom fetch implementation

enhancementNew feature or requestNew feature or request

Status: Open.

#66 In cloudflare/capnweb;

· jahands opened on Sep 30, 2025

Bun Support Missing

enhancementNew feature or requestNew feature or request

Status: Open.

#61 In cloudflare/capnweb;

· BurkeDesigns opened on Sep 27, 2025

Feature Request: Runtime Type Validation for Method Arguments

enhancementNew feature or requestNew feature or request

largeMajor project, days or weeks of work.Major project, days or weeks of work.

Status: Open.

#39 In cloudflare/capnweb;

· lbguilherme opened on Sep 23, 2025

Does Cap'n Web support Websocket Hibernation

enhancementNew feature or requestNew feature or request

largeMajor project, days or weeks of work.Major project, days or weeks of work.

Status: Open.

#36 In cloudflare/capnweb;

· natanparmigiano-paganinitech opened on Sep 23, 2025

Custom (de)serializer support?

enhancementNew feature or requestNew feature or request

Status: Open.

#32 In cloudflare/capnweb;

· cometkim opened on Sep 23, 2025

[Docs] Unclear how the bidirectional communication should work

documentationImprovements or additions to documentationImprovements or additions to documentation

Status: Open.

#30 In cloudflare/capnweb;

· c43721 opened on Sep 23, 2025