improve & correct the type declarations for BLOB (aws/smithy) types

[kuhe]

Describe the feature

shape members with type BLOB are treated too narrowly, being declared in the base request/response types as Uint8Array.

Example, Lambda's InvokeCommand's InvocationRequest.Payload.

Depending on the request handler (commonly node.http or fetch), this payload is passed with no modification as the request body. These native http implementations accept multiple types for their request bodies including string and other streaming formats.

Use Case

The type is too narrow and can confuse TypeScript users into thinking they need to convert their already-acceptable payloads, such as strings, into a Uint8Array before sending them over the SDK request.

Proposed Solution

expand the type declaration for BLOB types in client models to include accepted request body types in the environment's default request handler.

This should at the very least include strings.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

SDK version used

current

Environment details (OS name and version, etc.)

all

[kuhe]

some previous discussion: #2252

[kuhe]

work on this will be logged in #4786

[github-actions]

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