Support numeric separator (i.e. 123_456) #129
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ECMAScript numeric separator proposal is now on stage3 https://github.com/tc39/proposal-numeric-separator and will come to TypeScript at version 2.7. microsoft/TypeScript#20324 Example: ```typescript const i = 123_456; const x = 0x1fa_EF6; const f = 123_456.0_456; const f2 = 123_456.4_5e1_2; ```
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ECMAScript numeric separator proposal is now on stage3
https://github.com/tc39/proposal-numeric-separator
and will come to TypeScript at version 2.7.
microsoft/TypeScript#20324
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