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ActiveRecord: size vs count

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PDO MySQL: Use PDO::ATTR_EMULATE_PREPARES or not?

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What is the advantage of GCC's __builtin_expect in if else statements?

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Change key pair for ec2 instance

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What is a semaphore?

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What is the difference between statically typed and dynamically typed languages?

...amming languages are dynamically typed but what does it actually mean when we say a language is dynamically typed vs. statically typed? ...
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Are (non-void) self-closing tags valid in HTML5?

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WebSockets vs. Server-Sent events/EventSource

Both WebSockets and Server-Sent Events are capable of pushing data to browsers. To me they seem to be competing technologies. What is the difference between them? When would you choose one over the other? ...
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How to debug Ruby scripts [closed]

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How many bytes does one Unicode character take?

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