public ObjectNode getNumberMember(String key, Consumer<Number> consumer) {
        getNumberMember(key).map(NumberNode::getValue).ifPresent(consumer);
        return this;
    }
The same as {@link #expectNumberMember(String, Consumer)} but the member is optional.

@param key Key to retrieve.
@param consumer Consumer that accepts the number value.
@return Returns the node.
smithy-model/src/main/java/software/amazon/smithy/model/node/ObjectNode.java