[] -> 0 (type string)

[5apple] -> 5 (type string)

[NaN] -> 0 (type string)

[-NaN] -> nan (type strnum)

[+NaN] -> nan (type strnum)

[ 6] -> 6 (type strnum)

[0x1az] -> 26 (type string)

[011Q] -> 9 (type string)

[027] -> 23 (type strnum)