Kubernetes Bad Request "must match the regular expression '^([+-]?[0-9.]+)([eEinumkKMGTP]*[-+]?[0-9]*)$'"

One fine evening, while refreshing my kubernetes concepts, I was trying to write a simple deployment with their resource limits. And I conjured up with this little yaml thing-y

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app-resources
  labels: 
    app: my-app-resources
spec:
  replicas: 1
  selector:
    matchLabels:
      app: my-app-resources
  template:
    metadata:
      labels:
        app: my-app-resources
    spec:
      containers:
      - name: my-app-resources
        image: nginx:latest
        resources:
          requests:
            memory: "64Mib"
            cpu: "250m"
          limits:
            memory: "128Mib"
            cpu: "500m"
      - name: logging-sidecar
        image: busybox:1.28
        command: ['sh', '-c', "while true; do echo sync app logs; sleep 10; done"]
        resources:
          requests:
            memory: "128Mib"
            cpu: "100m"
          limits:
            memory: "256Mib"
            cpu: "200m"

Simple little thing, right! I tried deploying it and got the following beautiful error.

$ kubectl apply -f nginx-deployment-with-resource.yaml 
Error from server (BadRequest): error when creating "nginx-deployment-with-resource.yaml": Deployment in version "v1" cannot be handled as a Deployment: quantities must match the regular expression '^([+-]?[0-9.]+)([eEinumkKMGTP]*[-+]?[0-9]*)$'

And there begun my journey about losing my 10 precious minutes, I tried:-

validating the yaml. Looked fine.
Looked into different fields and found them generally okay.

After scratching my head for 10 mins, I realized that I have put the values for memory as "128 Mib" instead of the intended "128Mi". :(

Oh well, sometimes it pays to copy from the official documentation I guess.