read "500." :: Double fails

Summary

A common rendering of floating point numbers is not recognized by the Read instance.

Steps to reproduce

Prelude> read "500.0" :: Double
500.0
Prelude> read "500" :: Double
500.0
Prelude> read "500." :: Double
*** Exception: Prelude.read: no parse

Expected behavior

Prelude> read "500." :: Double
500.0

Environment

GHC version used: 8.6.5

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information