You can view the Pull Request on github:
https://github.com/php/php-langspec/pull/117
Pull Request Description:
* Clarify what whitespace is supported - this is not the same as the white-space production.
* Clarify that a sign is supported (which is not the case for the normal int/float productions)
* Clarify that we only support decimal digits (including leading zeros) or float literals
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