How to fix yaml: unmarshal errors: cannot unmarshal in Docker

yaml: unmarshal errors:
  line 15: cannot unmarshal !!str `true` into bool

# Wrong - line 15
privileged: "true"

# Correct
privileged: true

# WRONG - no space after colon
image:nginx:latest
ports:8080:80

# CORRECT - space after colon
image: nginx:latest
ports:
  - "8080:80"

# WRONG - strings, not booleans
tty: "true"
stdin_open: "false"
privileged: "yes"

# CORRECT - actual booleans
tty: true
stdin_open: false
privileged: true

# WRONG - may parse incorrectly
ports:
  - 8080:80
  - 3000:3000

# CORRECT - quoted strings
ports:
  - "8080:80"
  - "3000:3000"

# WRONG - single string
command: npm run start

# CORRECT - shell form (string)
command: "npm run start"

# CORRECT - exec form (array)
command: ["npm", "run", "start"]

# CORRECT - multi-line array
command:
  - npm
  - run
  - start

# WRONG - duplicate << keys
x-common: &common
  restart: always

x-logging: &logging
  logging:
    driver: json-file

services:
  app:
    <<: *common
    <<: *logging  # Error: mapping key '<<' already defined
    image: myapp

# CORRECT - single merge with multiple anchors
services:
  app:
    <<: [*common, *logging]
    image: myapp

x-base: &base
  restart: always
  logging:
    driver: json-file

services:
  app:
    <<: *base
    image: myapp

# WRONG - interpreted as float or integer
version: 3
version: 3.8

# CORRECT - quoted string
version: "3"
version: "3.8"

docker compose config

docker compose config --quiet && echo "Valid" || echo "Invalid"