why capacity marked as required but turns out it has default value 1 if use typed builder in WAF V2

[bijancot]

so just playing around with aws-sdk-rust (wafv2). I achieve my goals to get ip from cloudwatch -> create ip sets -> create rules -> attach ip sets to rules -> attach rules to waf acl -> done. But i forgot to set the capacity (wcu) on the rules but it success (good but why?) -> found out i'am not using option, i define the rules by using Rule types builder

the docs said it required but a lil bit confused because it enforce 1 wcu for rules that read 1 ip sets with 100 ip in it. I try read the operation builder here https://github.com/awslabs/aws-sdk-rust/blob/main/sdk/wafv2/src/operation/create_rule_group/builders.rs#L161-L180 i found nothing about the default value here but capacity is not defined here in types http://docs.rs/aws-sdk-wafv2/latest/aws_sdk_wafv2/types/struct.Rule.html

So is it expected?

Thank you!

[bijancot]

Or is there any way to set rule_group as rules for create_web_acl so i can attach a wcu for a rule group?