Question on Dual-Licensing Some Code for Phobos

[Jack Stouffer]

I'm starting work on a proposal for stdx.decimal, and one of the 
clearest implementations to work off of is the Python 
implementation.

This however, poses a problem because Python's source is under 
the PSFL, a BSD-like permissive license. Any derivative work, 
such as a D conversion, must have the original copyright notice, 
a copy of the PSFL, as a well as a summary of changes. This is 
simple enough to do, but the resulting code would be 
dual-licensed with the PSFL and the BSL 1.0 (dual-licensing being 
relatively common in other OSS projects).

My question is there any reason this could pose a problem? Could 
this interfere with something like distribution or company 
adoption?

Also note, one of the existing Phobos modules, std.net.isemail, 
is supposed to be dual-licensed because it's derived from an 
existing BSD work. But, it's missing the BSD license from the top 
(and is technically breaking the license because of that).