So for now the only addition we may probably consider for 5.1 is adding 4: optional typehinted values that default to null and only null.
Please don't add another parameter syntax (especially with line-noi... err special characters) like [BaseClass]. This would make PHP more unreadable than it needs to be for a minor feature. To allow foo(BaseClass $objA = null) to also accept foo(null); handles the few cases where you want to pass null nicely IMHO.
Advocating to only change the PHP syntax to simplify it, - Chris
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