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define: DUK_USE_NONSTD_ARRAY_CONCAT_TRAILER
feature_enables: DUK_OPT_NONSTD_ARRAY_CONCAT_TRAILER
introduced: 1.0.0
default: true
tags:
- ecmascript
- compliance
description: >
For better compatibility with existing code, enable non-standard
Array.prototype.concat() behavior for trailing non-existent elements of
the concat result, see
https://github.com/svaarala/duktape/blob/master/tests/ecmascript/test-bi-array-proto-concat-nonstd-trailing.js.
If this option is disabled, concat() will behave in a strictly conforming
fashion, ignoring non-existent trailing elements in the result length.