Ensure consistent string encoding

[tobias-kuendig]

Depending on the environment (Browser, App), sendEvent seems to use different string encoding.

For example, this code:

sendEvent('s', 'join', 'ä123')

Is received as \xE4\x31\x32 in the app. It seems to be encoded as ISO-8859-1, even though the document's encoding is UTF-8. Because of the multi-byte character (ä), the last byte (3) seems to go missing.

What is the proper way to ensure a consistent encoding for sendEvent across all environments?