Validates that a value is true.

Uses strict equality (== true), not truthiness. This is useful for validating boolean flags like acceptance checkboxes.

Optional Options

• :message - Custom error message callback (value -> String.t())

Examples

iex> Funx.Validator.IsTrue.validate(true)
%Funx.Monad.Either.Right{right: true}

iex> Funx.Validator.IsTrue.validate(false)
%Funx.Monad.Either.Left{left: %Funx.Errors.ValidationError{errors: ["must be true"]}}

iex> Funx.Validator.IsTrue.validate(1)
%Funx.Monad.Either.Left{left: %Funx.Errors.ValidationError{errors: ["must be true"]}}