Using @aws-sdk/signature-v4a to sign a sigv4 request?

[justin-masse]

Hello,

In the aws-crt implementation of @aws-sdk/signature-v4-multi-region it would sign the request as "sigv4" if you did not set signing region to * but with this new signature-v4a package if you set signing region to us-east-1 for example the signature is changed and it's adding the x-amz-region-set header as us-east-1.

I just want to confirm that this is still a valid sigv4 request? Or is this something where we need to specifically sign as sigv4 directly if signing region is not * by ourselves?