r. TSRM environment locking
s. Typed references support
t. Exceptions thrown by string conversions.
+ u. Removed uint and ulong typedefs
2. Build system changes
a. Abstract
an exception. For instructions on how to gracefully handle this see
https://wiki.php.net/rfc/tostring_exceptions#extension_guidelines.
+ u. The Windows typedefs uint and ulong are no longer available, and have to be
+ replaced with standard types.
+
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2. Build system changes
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