Inconsistent Phone number Normalization

[MartinGaoR]

1
Input Number: 840938816460
CountryCode: VN
Output Number : 84938816460 (Vietnam number)
2
Input Number: 65082666437
CountryCode: SG
Output Number 65082666437 (expecting 6582666437, Singapore Number)
3
Input Number: 6582666437-0S0O0MEOTHERTAG
CountryCode: SG
Output Number: 6582666437000 (expecting error as it is not a number at all)

Generally there are 2 problems in this issues, 1. inconsistent results comparing test case 1 and 2.
2. The normalizer might have some false positive. Thanks~