`params[:foo].to_bool`, `ENV['bar'].to_bool` and others

to_bool.rb

# frozen_string_literal: true

class Object
  # Convert to a boolean value (special cased for String/Numeric).
  # @return [Boolean] false for nil and false ('true', '1' return true and 0 returns false)
  # @see String#to_bool
  # @see Numeric#to_bool
  def to_bool
    !!self
  end
end

class String
  # @return [Boolean] 'true' and '1' are considered truthy
  def to_bool
    'true'.casecmp(self).zero? || '1'.eql?(self)
  end
end

class Numeric
  # @return [Boolean] false for 0, true otherwise
  def to_bool
    !zero?
  end
end