FileMaker treats string without numbers as false

The Following has a result of: 1
----------------< Start Block >----------------------
Let ( [
    ~result = "abceefghijlomonp"
];
    not ~result
)
----------------< End Block >------------------------

The following has a result of: 0
----------------< Start Block >----------------------
Let ( [
    ~result = "abceefghijlomonp123"
];
    not ~result
)
----------------< End Block >------------------------

Result: 0
----------------< Start Block >----------------------
Let ( [
    ~result = "1"
];
    not ~result
)
----------------< End Block >------------------------

Result: 0
----------------< Start Block >----------------------
Let ( [
    ~result = 1
];
    not ~result
)
----------------< End Block >------------------------

Result: 0
----------------< Start Block >----------------------
Let ( [
    ~result = True
];
    not ~result
)
----------------< End Block >------------------------

Result: 1
----------------< Start Block >----------------------
Let ( [
    ~result = False
];
    not ~result
)
----------------< End Block >------------------------

Result: 1
----------------< Start Block >----------------------
Let ( [
    ~result = "0"
];
    not ~result
)
----------------< End Block >------------------------

Result: 1
----------------< Start Block >----------------------
Let ( [
    ~result = ""
];
    not ~result
)
----------------< End Block >------------------------

Resutl: 1
----------------< Start Block >----------------------
Let ( [
    ~result = "  "
];
    not ~result
)
----------------< End Block >------------------------

Result: 1
----------------< Start Block >----------------------
Let ( [
    ~result = "a b c"
];
    not ~result
)
----------------< End Block >------------------------

Result: 1
----------------< Start Block >----------------------
Let ( [
    ~result = "a b c ,:@#$%^&*()-=~`;'[]{}"
];
    not ~result
)
----------------< End Block >------------------------