Default values for missing env variables do not work for duration and int

[sergevoloshyn]

Hey!

I wonder why default value for Strings works fine, but for config like:

rate-limiter { event-count = 2 event-count = ${?RATE_LIMITER_EVENT_COUNT} interval = 1s interval = ${?RATE_LIMITER_INTERVAL} }

I'm getting
interface conversion: hocon.Value is hocon.Duration, not hocon.String for Duration value
and
panic: runtime error: integer divide by zero for Int value (rate-limiter.event-count is loaded as zero)