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Add support for host features. #91

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23 changes: 23 additions & 0 deletions abi-versions/vNEXT/HOST_FEATURES.md
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# Host features

| Identifier | Name | Values | Deprecated |
|:----------:|:-------------------------|:---------------------------------------------------------------------------------------------------|:----------:|
| 0x0001 | `HAS_CORE` | When `1`, all baseline functions considered essential are supported. | No |
| 0x0002 | `HAS_LOGGING` | When `1`, all baseline functions for logging are supported. | No |
| 0x0003 | `HAS_HTTP_HEADERS` | When `1`, only baseline functions related to HTTP headers are supported. | No |
| 0x0004 | `HAS_HTTP_WITH_BODY` | When `1`, all baseline functions for HTTP are supported. | No |
| 0x0005 | `HAS_HTTP_CALLS` | When `1`, all baseline functions for HTTP calls are supported. | No |
| 0x0006 | `HAS_GRPC_CALLS` | When `1`, all baseline functions for gRPC calls are supported. | No |
| 0x0007 | `HAS_GRPC_STREAMS` | When `1`, all baseline functions for gRPC streams are supported. | No |
| 0x0008 | `HAS_TCP_FILTER` | When `1`, only baseline functions related to new TCP connections are supported. | No |
| 0x0009 | `HAS_TCP_WITH_PAYLOAD` | When `1`, all baseline functions for TCP are supported. | No |
| 0x000A | `HAS_KEY_VALUE_STORES` | When `1`, all baseline functions for key-value stores are supported. | No |
| 0x000B | `HAS_SHARED_QUEUES` | When `1`, all baseline functions for shared queues are supported. | No |
| 0x000C | `HAS_TIMERS` | When `1`, all baseline functions for timers are supported. | No |
| 0x000D | `HAS_METRICS` | When `1`, all baseline functions for metrics are supported. | No |
| 0x000E | `HAS_PROPERTIES` | When `1`, all baseline functions for properties are supported. | No |
| 0x000F | `HAS_CUSTOM_FUNCTIONS` | When `1`, all baseline functions for custom functions are supported. | No |
| 0x0F01 | `HAS_WASI_PREVIEW1_CORE` | When `1`, all baseline functions considered essential from WASI Preview1 are supported. | No |


Identifiers below 0x2000 are reserved for standardized features and options. Random numbers above that range should be used for private extensions.
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