[Issue 18700] New: iota with floating type + padRigh asserts

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18700

          Issue ID: 18700
           Summary: iota with floating type + padRigh asserts
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: santerkrupp at gmail.com

The following triggers an assertion std.range.package.d (source line 5632 for
tag 2.079.0):

iota(6.).padRight(0, 10).slide(4)

The problem occurs when:
 - iota is floating type
 - padRight causes padding to the original size of the iota plus the size of
the slide (e.g. 6 + 4 == 10 in the above)

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