Character limit on Claudia's Button template differs from Facebook specs

[samcorcos]

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• Expected behaviour:

As I understand it, Claudia is mapping the Button template to the Facebook button template. According to the facebook docs, the text field should be able to handle up to 320 characters:

text must be UTF-8 and has a 320 character limit

• What actually happens:

...however, when I actually run it, I seem to be limited to 80 characters. This code works:

  const text = Array(80).fill("x").join('')
  return new builder.fbTemplate.Button(text)
    .addButton('foo', 'bar')
    .get()

and this code does not work:

  const text = Array(81).fill("x").join('')
  return new builder.fbTemplate.Button(text)
    .addButton('foo', 'bar')
    .get()

• Which bot engine (facebook, skype...):

facebook

• Link to a minimal, executable project that demonstrates the problem:

I can provide one if necessary, but any configured facebook chatbot should have the same behavior.

• Steps to install the project:

no special configuration

• Steps to reproduce the problem:

try to render a Button with text > 80 chars