escapeHTML option isn't respected in v6 with storiesOf

[tay1orjones]

Describe the bug
Since updating to v6, my stories using the storiesOf api that configure the escapeHTML addon-knobs option present an error.

Config at the story level:

{
  knobs: {
    escapeHTML: false, // needed for greater than less than
  },
}

Error I see that relates to invalid props being passed on storyshot generation due to being HTML escaped:

Failed: "Warning: Failed prop type: Invalid prop `comparison` of value `&lt;` supplied to `Threshold`, expected one of [\"<\",\">\",\"=\",\"<=\",\">=\"].

I know I can migrate these stories to CSF and it will probably fix it, but it's my understanding that storiesOf is intended to be supported for the time being.

[shilman]

If this is a problem (haven't confirmed), it's a regression in addon-knobs and unrelated to storiesOf vs CSF (which are almost entirely isomorphic -- CSF executes storiesOf API under the hood)

FYI, we’ve released addon-controls in Storybook 6.0. Controls are portable, auto-generated knobs that are intended to replace addon-knobs long term. (Note: escapeHtml is not yet supported in controls storybookjs/storybook#12516)

• Controls documentation
• Migration instructions

Please upgrade and try them out today!

[stale]

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