Is introducing underscores in literals in java beneficial or a drawback?

Though oracle technotes state that : > In Java SE 7 and later, any number of underscore characters (_) can > appear anywhere between digits in a numerical literal. This feature > enables you, for example, to separate groups of digits in numeric > literals, which can improve the readability of your code. example : float pi = 3.14_15F; is same as float pi = 3.1415F; But does it not become confusing to the developers working on code written by someone else? Also does the use of underscore put any overhead on compiler or not?
Compiler overhead? Ignoring a couple characters here and there isn't going to cost anything measurable. Think of all the whitespace that's already ignored.

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