-- docs
new file conversion.h;  now predicated_range is convertible to any std-contaner

scc 'vint r = v9 | (_1>3);  r'
mapped_range now is convertible to stl-container

sccl 'vector<size_t> v=(vs9 * size); v'
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
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