[Issue 21721] casting std.BigInts to built-in floating point types doesn't work without -preview=dip1000

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21721

Nathan S. <n8sh.secondary at hotmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|casting std.BigInts to      |casting std.BigInts to
                   |built-in floating point     |built-in floating point
                   |types not allowed in        |types doesn't work without
                   |`@safe` code without        |-preview=dip1000
                   |-preview=dip1000            |

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