pg_dump with compressible and non-compressible tables

Hi,

v9.6

We've got big databases where some of the tables are highly compressible, 
but some have many bytea fields containing PDF files.

When the data format is custom, directory or tar, how feasible would a 
"--no-blob-compression" option be (where pg_dump just tells the zlib library 
to just Store tables with bytea columns, while compressing all other tables 
at the specified -Z level)?

Thanks

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