Episode #10: LSP and Operator Precedence

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Episode 10 — LSP and Operator Precedence — Nikita Popov
https://wiki.php.net/rfc/ternary_associativity — https://github.com/php/php-src/pull/4017/files#diff-02b0ba36e963ebca22e7f764721073a5R1
http://wiki.php.net/rfc/concatenation_precedence — Deprecate only: https://github.com/php/php-src/pull/4001/files


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