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f ZG dd� dej�ZdS )zCImplementation of the metadata abstraction for gRPC Asyncio Python.� )� OrderedDict)�abc)�Any�Iterator�List�Optional�Tuple�Unionc @ sf e Zd ZdZeeef dd�dd�Zee d�dd��Z
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The metadata is a mapping from str -> List[str]
Traits
* Multiple entries are allowed for the same key
* The order of the values by key is preserved
* Getting by an element by key, retrieves the first mapped value
* Supports an immutable view of the data
* Allows partial mutation on the data without recreating the new object from scratch.
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this would return all items under the desired <key>.
)r r9 r0 r r r r* m s zMetadata.get_all)r r r c C s || j |< d S r
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MetadataValuer � classmethodr? r r �intr" r( r, r. r1 r r3 r r4 r5 r6 r r7 r2 r r9 r r* r: �boolr; r rB rC �strrF r r r r r
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