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Emoji-gate synchronous future/stream read/write #641

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lukewagner merged 1 commit into from
Apr 30, 2026
+3 −1
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Emoji-gate synchronous future/stream read/write #641

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2 changes: 2 additions & 0 deletions design/mvp/CanonicalABI.md
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Expand Up @@ -4356,6 +4356,7 @@ specifies:
* [`lower($t)` above](#canonopt-validation) defines required options for `stream.write`
* [`lift($t)` above](#canonopt-validation) defines required options for `stream.read`
* `memory` is required to be present
* 🚝 - `async` is allowed to be omitted, otherwise it must be present

The implementation of these built-ins funnels down to a single `stream_copy`
function that is parameterized by the direction of the copy:
Expand Down Expand Up @@ -4478,6 +4479,7 @@ specifies:
* [`lift($t)` above](#canonopt-validation) defines required options for `future.read`
* [`lower($t)` above](#canonopt-validation) defines required options for `future.write`
* `memory` is required to be present
* 🚝 - `async` is allowed to be omitted, otherwise it must be present

The implementation of these built-ins funnels down to a single `future_copy`
function that is parameterized by the direction of the copy:
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2 changes: 1 addition & 1 deletion design/mvp/Explainer.md
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Expand Up @@ -50,7 +50,7 @@ implemented, considered stable and included in a future milestone:
* 🪙: value imports/exports and component-level start function
* 🪺: nested namespaces and packages in import/export names
* 🔀: async
* 🚝: marking some builtins as `async`
* 🚝: enabling more canonical ABI options on more async-related builtins
* 🚟: using `async` with `canon lift` without `callback` (stackful lift)
* 🧵: threading built-ins
* 🧵②: [shared-everything-threads]-based threading built-ins
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