or">?</span><span class="clearfix"><span class="floating-right">(<a href="https://github.com/buszi/Boomerang/src/commonMain/kotlin/io/buszi/boomerang/core/Boomerang.kt#L139">source</a>)</span></span></div><p class="paragraph">Retrieves a list of Boomerang instances for the given key.</p><span class="kdoc-tag"><h4 class="">Return</h4><p class="paragraph">The list of Boomerang instances, or null if no list exists for the key</p></span><h4 class="">Parameters</h4><div class="table"><div class="table-row" data-