[racket] duplicate/copy a namespace

Hi all -

is there a way to duplicate or copy a namespace?  It looks like I can use
namespace-mapped-symbols, namespace-variable-value, and
namespace-variable-set-value! to copy the results from one namespace to
another, but this only works for variables, not syntaxes that resides in the
source namespace.

Any ideas are appreciated.  Thanks,
yc
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