Phone number detection doesn't work without area code

[CalebCourier]

from guardrails.hub import DetectPII

pii_guard = DetectPII(
    pii_entities=["PHONE_NUMBER"],
    on_fail="fix"
)

long_phone_number = "555 867 5309"

long_result = pii_guard.validate(long_phone_number, {})

# This correctly fails
assert long_result.outcome == "fail"


short_phone_number = "867 5309"

short_result = pii_guard.validate(short_phone_number, {})

# This should fail but it doesn't!
assert short_result.outcome == "fail", f"Expected short_result.outcome to be \"fail\" but it was \"{short_result.outcome}\" instead!"