Bump on this. It seems like it happens with booleans as well. Pulumi somehow converts things into a type. It's making me unable to deploy to ECS... Variable definition:

config:
  biosys:ALLOW_PUBLIC_REGISTRATION: !!str 'True'

Code:

environment:
            # <https://www.pulumi.com/registry/packages/awsx/api-docs/ecs/fargatetaskdefinition/#taskdefinitionkeyvaluepair>
            - name: ALLOW_PUBLIC_REGISTRATION
              value: !!str "${ALLOW_PUBLIC_REGISTRATION}"

Error:

aws:ecs:TaskDefinition (biosys-440-service):
    error: aws:ecs/taskDefinition:TaskDefinition resource 'biosys-440-service' has a problem: ECS Task Definition container_definitions is invalid: Error decoding JSON: json: cannot unmarshal bool into Go struct field KeyValuePair.Environment.Value of type string. Examine values at 'TaskDefinition.ContainerDefinitions'.

Seems like this resolves it (not sure if it's a solution or a workaround)

biosys:ALLOW_PUBLIC_REGISTRATION: |-
   "True"

I will try this with my port number @gifted-cat-49297 may be useful to you with your float