support scientific nations for float options

- reference: https://stackoverflow.com/questions/638565/parsing-scientific-notation-sensibly
- remove the todo comment(no idea for etc)

Signed-off-by: Hansuk <flavono123@gmail.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/lib/slop/types.rb b/lib/slop/types.rb
index 07d7e62..c1055ea 100644
--- a/lib/slop/types.rb
+++ b/lib/slop/types.rb
@@ -52,8 +52,7 @@ module Slop
   # Cast the option argument to a Float.
   class FloatOption < Option
     def call(value)
-      # TODO: scientific notation, etc.
-      value =~ /\A[+-]?\d*\.*\d+\z/ && value.to_f
+      value =~ /\A[+-]?(?:0|[1-9]\d*)(?:\.\d*)?(?:[eE][+-]?\d+)?\z/ && value.to_f
     end
   end