Validate normalization rules

String 

--

Number input type is always normalized to the string type, for example:

42 → "42"

The boolean values can be normalized to the string output type as:

true →  "true"

false → "false"

Null input type coerces to an empty string as shown:

null → ""

Number

String input type can be normalized to a number if the string is a valid number, for example:

"42" → 42

Normalization to an integer is possible if the string is a valid number without the fraction part. 

-- 

The boolean values can be normalized to a number type output types as follows:

true →  1

false → 0

Null input type normalizes to 0 as shown:

null → 0 

Boolean

Only the following strings can be normalized to the Boolean type:

"true" → true

"false" → false

Only the following numbers can be normalized to the  boolean data type:

1 → true

0 → false

--

Null value is normalized to a boolean false value as shown:

null → false

Null

Only empty strings can be normalized to null

Only empty strings can be normalized to null

Boolean value false normalized to null

true can't be normalized

--