abstract operation
- If m is NaN, return the String "NaN".
- If m is +0 or -0, return the String "0".
- If m is less than zero, return the String concatenation of the String "-" and ToString(-m).
- If m is infinity, return the String "Infinity".
- let n, k, and s be integers such that k >= 1, s in [10^(k-1), 10^k), the Number value for s * 10^(n-k) is m. Note that k is the number of digits in the decimal representation of s, that s is not divisible by 10.
- if both k and n are no greater than 21:
- if k is no greater than n, return the string-concatenation of:
- the k digits of the decimal representation of s
- n−k occurrences of the character 0
- if n is greater than 0, return the string-concatenation of:
- the code units of the most significant n digits of the decimal representation of s
- the code unit 0x002E (FULL STOP)
- the code units of the remaining k - n digits of the decimal representation of s
- if k is no greater than n, return the string-concatenation of:
- ...
example 0.12300
k=3, s=123, n=0
example 123.4
n=k1=3, k2=1, s=123.4
example 0.0423
k=3, s=423, n=-1 ==> k1=n=-1,pow(10,k1-1)=0.04
example 42300
k=3, s=423, n=5 ==> pow(10, n-1) = 4
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