s"></i></a></span> <span class="modifier_kind"><span class="modifier">final </span> <span class="kind">def</span></span> <span class="symbol"><span class="name deprecated" title="gt4s: $plus$eq. Deprecated: (Since version 2.13.0) Use ++= aka addAll instead of varargs +=; infix operations with an operand of multiple args will be deprecated">+=</span><span class="params">(<span name="elem1">elem1: <span name="scredis.util.LinkedHashSet.LinkedHashSetBuilder.A" class="extype">A</span></span>, <span name="ele