Micronaut parameters binding in Kotlin controller

StackSample.kt

package com.helpchoice.kotlin.hal

import io.micronaut.http.MediaType
import io.micronaut.http.annotation.Controller
import io.micronaut.http.annotation.Get

@Controller("/", produces = [MediaType.APPLICATION_HAL_JSON])
class StackSample {

    // @Get("/repeat/{value}{/stack")
    // fun dup(value: Number, stack: List<Number>): Map<String, Any?>
    @Get("/repeat/{value:[0-9]+(\\.[0-9]+)}{/stack:[0-9]+(\\.[0-9]+)?(/[0-9]+(\\.[0-9]+)?)*}/")
    fun dup(value: String, stack: String?): Map<String, Any?> {
        val baseHref = "/$value/$value/${stack}"
        val selfHref = "/repeat/$value/$stack"
        return mapOf(
                "_links" to mapOf(
                        "self" to mapOf(
                                "href" to selfHref,
                                "type" to MediaType.APPLICATION_HAL_JSON
                        )
                ),
                "stack" to stack,
                "value" to value
        )
    }

    // @Get("/repeat/{value}{/stack")
    // fun dup(stack: List<Number>): Map<String, Any?>
    @Get("/{stack:[0-9]+(\\.[0-9]+)?(/[0-9]+(\\.[0-9]+)?)*}/")
    fun number(stack: String): Map<String, Any?> {
        val numbers = stack.split("/")
//        val (_, value) = NumericStack(numbers, 1)
        val selfHref = "/$stack"
        return mapOf(
                "_links" to mapOf(
                        "self" to mapOf(
                                "href" to selfHref,
                                "type" to MediaType.APPLICATION_HAL_JSON
                        )
                ),
                "stack" to stack
        )
    }

}

StackSampleTest.kt

package com.helpchoice.kotlin.hal

import io.kotlintest.specs.StringSpec

internal class StackSampleTest : StringSpec() {
    init {

        fun stack() {
        }

        fun dup() {
        }
    }
}

This is a small sample project I try to make with Micronaut in Kotlin.

Unfortunately the only parameters binding I was able to do as in the code. However I would like to be able to do something like in comments. Is it possible to do that and why it doesn't work for me?

Also for the tests I couldn't figure out how to start the test server from KotlinTest. Any ideas?

Thanx in advance.