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Update README.md and Explainer.md to account for WASI 0.3.1 release #693

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lukewagner merged 1 commit into from
Aug 13, 2026
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Update README.md and Explainer.md to account for WASI 0.3.1 release #693

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2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -28,6 +28,8 @@ The current WASI Developer Preview releases are:
Model and [WIT]; adds `async` functions, `stream`s and `future`s as
well as new [ABI] built-in functions (additions are marked by the 🔀
emoji throughout the repo).
* 0.3.1: adds the `map<K,V>` type (🗺️) and the `implements` and `external-id`
annotations (🏷️).

Subsequent WASI Developer Preview releases will include other emoji-[gated
features] such as cooperative threads (🧵).
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20 changes: 13 additions & 7 deletions design/mvp/Explainer.md
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Expand Up @@ -51,12 +51,20 @@ feature](FutureFeatures.md) backlog.)
By default, the features described in this explainer (as well as the supporting
[Binary.md](Binary.md), [WIT.md](WIT.md) and [CanonicalABI.md](CanonicalABI.md))
have been implemented and are included in the [WASI] 0.2 Developer Preview
release. The WASI 0.3 Developer Preview release additionally includes the
features gated by 🔀.
release. All additions since 0.2 are explicitly marked with Unicode symbols
("emoji-gated") to indicate which specific text- and binary-format productions
or semantic rules were added.

The following features have already shipped as part of a subsequent [WASI]
Developer Preview release, as recorded in the [top-level readme](../../README.md),
and thus are not open to breaking changes before the final 1.0 release:
* 🔀: native concurrency support with `async`, `stream` and `future`
* 🗺️: the `map` type
* 🏷️: `implements` and `external-id` annotations for imports/exports

The other features, in various stages of implementation, polish and release,
are gated by the following emojis and, when ready, may be included in
subsequent WASI Developer Preview minor releases:
All other features are in various stages of implementation, are not enabled by
default, may have breaking changes, and, after a suitable [WASI] SG vote, may be
shipped as part of a future WASI Developer Preview release:
* 🪙: value imports/exports and component-level start function
* 🪺: nested namespaces and packages in import/export names
* 🚝: enabling more canonical ABI options on more async-related builtins
Expand All @@ -67,8 +75,6 @@ subsequent WASI Developer Preview minor releases:
* 📝: the `error-context` type
* 🔗: canonical interface names
* 🐘: [memory64]
* 🗺️: the `map` type
* 🏷️: `implements` annotations for plain-named interface imports/exports


## Grammar
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