How to set file attributes(mode)?

i'm trying to sync s3<->local in bidirectional way.

Sync local file to s3 keeps its own file mode like 666.

But, sync s3 file which is uploaded through S3 management console to local is always '-rwxr-xr-x'.

How to force the file to have '-rw-r--r--'?

The issue names no file, test, or entry point. Start by locating the bidirectional sync command and the code that assigns modes to files downloaded from S3; done means the requested mode can be configured and is applied consistently to downloaded files.

Written by the indexing model from the issue text.