`Parser.int`, `Parser.float`: unexpected interest in leading and trailing characters

[lue-bird]

• Parser.float consumes '.' without any decimals
• Parser.int, Parser.float commit on leading 'e'/'E'
• Parser.int fails on trailing '.', 'e'
  in
  • Float parser comitting to leading 'e' elm/parser#44
  • int parser fails on trailing "e" elm/parser#28
  • Parser.int accepts input starting with e elm/parser#25
  • int parser fails on trailing decimal separator elm/parser#14