Validates that a value is strictly less than a given reference value using an Ord comparator.

Options

• :value (required) - The reference value to compare against
• :ord (optional) - An ordering comparator. Defaults to Funx.Ord.Protocol
• :message (optional) - Custom error message callback (value -> String.t())

Semantics

• If the value compares as :lt relative to the reference, validation succeeds.
• If the value compares as :eq or :gt, validation fails.
• Nothing values pass unchanged.
• Just values are unwrapped before comparison.