Thousands Seperator

In ruby, underscore can be inserted into integer literals as thousands separator.

For example:

1_000 will be interpreted as 1000
1_000 + 1_000 will equal 2000
1_000_000_000 will be interpreted as 1 billion

the same technique works for float number as well

For example:

1_000.1 will be interpreted as 1000.1


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