[Issue 15364] BitArray.len should be private

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15364

--- Comment #3 from b2.temp at gmx.com ---
If you land here because some code is broken in phobos 2.070 note that you can
fix by using the copy constructor that takes a size_t & void* (len,ptr) as
parameter.

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