Cordova changes plugin version in package.json

I observed that Cordova changes the version of plugins in package.json. So if I set a static version for a plugin in package.json and add a platform (e.g. android), Cordova installs the correct version but updates the version of the plugin in package.json with a caret(^).

Example:

Before adding a platform the package.json looks like that

[...]
"dependencies": {
  "cordova-plugin-ble-central": "1.1.9"
}
[...]

After adding a platform the package.json looks like that

[...]
"dependencies": {
  "cordova-plugin-ble-central": "^1.1.9"
}
[...]

and the installed plugin has the version 1.1.9.

The next time after removing my plugins and platforms folder Cordova will install that plugin in version 1.2.1 because of the caret(^) in package.json.