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See: https://github.com/opnsense/lang
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(traffic shaper) add advanced option schedule type for pipe, makes current default (wf2q+) explicit. related to https://github.com/opnsense/core/issues/505

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https://github.com/opnsense/core/commit/2ba1c056046967b61c74ee100bfa52ad3da49e36#commitcomment-17217733

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(cherry picked from commit 711ffa08)