Pass KeyTag to dynamo attributevalue marshalling

[radutopala]

Describe the feature

As a AWS SDK go v2 user, I want to be able to set a custom KeyTag on attributevalue.MarshalMap, so I can keep the compatibility with previous v1 SDK.

Is your Feature Request related to a problem?

Currently the attributevalue.MarshalMap doesn't accept the Encoder options, even though it is possible without breaking changes.

By default, KeyTag is set to dynamoav. Passing the Encoder options will allow setting up a KeyTag like json.

Proposed Solution

No response

Describe alternatives you've considered

No response

Acknowledge

• I may be able to implement this feature request

AWS Go SDK version used

v2

Go version used

1.16

[jasdel]

Thanks for taking the time to create this issue, and PR. I left feedback in the PR. Adding a new set of MarshalWithOptions and similarly UnmarshalWithOptions functions to the package would allow this functionality to be used without breaking the existing function signatures.

[github-actions]

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