JSON FILE TEXT READ:
{
    "null_value" : "null",
    "boolean_true" : false,
    "boolean_false" : true,
    "string" : "this is my string.",
    "integer_number" : 3.14159,
    "number_examples" : {
        "positive integer" : 9,
        "negative integer" : -1,
        "float" : 2.3,
        "positive_exponent" : 435E56,
        "negative_exponent" : 435.08E-95,
        "not a number" : "NaN"
    },
    "array" : [true,null,["value3"],{"key4":"value5"}]
}

JSON FILE TEXT AFTER REPLACING ,null, WITH ,"null",:
{
    "null_value" : "null",
    "boolean_true" : false,
    "boolean_false" : true,
    "string" : "this is my string.",
    "integer_number" : 3.14159,
    "number_examples" : {
        "positive integer" : 9,
        "negative integer" : -1,
        "float" : 2.3,
        "positive_exponent" : 435E56,
        "negative_exponent" : 435.08E-95,
        "not a number" : "NaN"
    },
    "array" : [true,"null",["value3"],{"key4":"value5"}]
}

The JSON parse succeeded.

FORMATTED HASHED JSON DATA:
array => True null value3 key4	value5
boolean_false => True
boolean_true => False
integer_number => 3.14159
null_value => null
number_examples => positive integer	9 negative integer	-1 float	2.3 positive_exponent	4.35e+58 negative_exponent	4.3508e-93 not a number	NaN
string => this is my string.

There is no documentation for JSON::Tiny, I don't
know what to use for a JSON NULL or None value.
FORMATTED HASHED JSON DATA AFTER CHANGING null_value FROM null TO NULL:
array => True null value3 key4	value5
boolean_false => True
boolean_true => False
integer_number => 3.14159
null_value => NULL
number_examples => positive integer	9 negative integer	-1 float	2.3 positive_exponent	4.35e+58 negative_exponent	4.3508e-93 not a number	NaN
string => this is my string.

FORMATTED HASHED JSON DATA AFTER CHANGING boolean_true FROM False TO True:
array => True null value3 key4	value5
boolean_false => True
boolean_true => True
integer_number => 3.14159
null_value => NULL
number_examples => positive integer	9 negative integer	-1 float	2.3 positive_exponent	4.35e+58 negative_exponent	4.3508e-93 not a number	NaN
string => this is my string.

FORMATTED HASHED JSON DATA AFTER CHANGING boolean_false FROM True TO False:
array => True null value3 key4	value5
boolean_false => False
boolean_true => True
integer_number => 3.14159
null_value => NULL
number_examples => positive integer	9 negative integer	-1 float	2.3 positive_exponent	4.35e+58 negative_exponent	4.3508e-93 not a number	NaN
string => this is my string.

FORMATTED HASHED JSON DATA AFTER CHANGING integer_number FROM 3.14159 TO 3:
array => True null value3 key4	value5
boolean_false => False
boolean_true => True
integer_number => 3
null_value => NULL
number_examples => positive integer	9 negative integer	-1 float	2.3 positive_exponent	4.35e+58 negative_exponent	4.3508e-93 not a number	NaN
string => this is my string.

FORMATTED HASHED JSON DATA AFTER DELETING number_examples -> "not a number":
array => True null value3 key4	value5
boolean_false => False
boolean_true => True
integer_number => 3
null_value => NULL
number_examples => positive integer	9 negative integer	-1 float	2.3 positive_exponent	4.35e+58 negative_exponent	4.3508e-93
string => this is my string.

I cheated by not searching array for the index of the
hash and instead just used 3 as the index of the hash.
FORMATTED HASHED JSON DATA AFTER CHANGING value5 TO value4:
array => True null value3 key4	value4
boolean_false => False
boolean_true => True
integer_number => 3
null_value => NULL
number_examples => positive integer	9 negative integer	-1 float	2.3 positive_exponent	4.35e+58 negative_exponent	4.3508e-93
string => this is my string.

JSON DATA IS NOW:
{ "null_value" : "NULL", "boolean_true" : true, "boolean_false" : false, "string" : "this is my string.", "integer_number" : 3, "number_examples" : { "positive integer" : 9, "negative integer" : -1, "float" : 2.3, "positive_exponent" : 4.35e+58, "negative_exponent" : 4.3508e-93 }, "array" : [ true, "null", [ "value3" ], { "key4" : "value4" } ] }