The sample from the front page fails

[retorquere]

this script

require "config"

config = Config.parse("username: chris, link: https://github.com/chris-huxtable/config.cr")

username = config.as_s("username")
link = config.as_a("link")

fails with the message

Unhandled exception: Cast from String to Array(T) failed, at /Users/emile/github/unicode2latex/lib/config/src/config/any.cr:223:10:223 (TypeCastError)
  from lib/config/src/config/any.cr:223:10 in 'as_a'
  from lib/config/src/config/any.cr:240:10 in 'as_a'
  from tt.cr:6:1 in '__crystal_main'
  from /opt/homebrew/Cellar/crystal/1.10.1/share/crystal/src/crystal/main.cr:129:5 in 'main_user_code'
  from /opt/homebrew/Cellar/crystal/1.10.1/share/crystal/src/crystal/main.cr:115:7 in 'main'
  from /opt/homebrew/Cellar/crystal/1.10.1/share/crystal/src/crystal/main.cr:141:3 in 'main'

using Crystal 1.10.1 (2023-10-13)