Highcharts-core

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* **BUGFIX:** Fixed ``.from_array()`` de-serialization to support propagation of string-type ``x`` values to ``name``(67).

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* **BUGFIX:** Fixed error when loading certain Highcharts (JS) scripts in Jupyter context.
* **ENHANCEMENT:** Increased the default timeout for ``Chart.download_chart()`` and related.

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* **BUGFIX:** Fixed behavior where ``Chart.download_chart(format = 'svg')`` was incorrectly returning a PNG rather than an SVG ( 63 ).

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* **ENHANCEMENT:** Added autoconversion of ``plotLine.value`` from ``datetime.datetime`` to POSIX timestamp (58).
* **BUGFIX:** Fixed incorrect ``datetime`` serialization to SECONDS from Unix epoch. Now serializing to JS-compatible MILLISECONDS from Unix epoch (61).

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* **ENHANCEMENT:** Align the API to **Highcharts (JS) v.11.1** (52). In particular, this includes:

* Added ``AccessibilityPoint.description_format`` property.
* Added support for ``.legend_symbol`` to plot options and series options.
* Added ``.border_radius`` support to ``FunnelOptions`` and ``FunnelSeries``.
* Added ``.interpolation`` support to ``HeatmapOptions`` and descendents.
* Added ``.point_description_format`` support to ``SeriesOptions`` and descendents.
* Added ``.fill_space`` support to ``TreegraphOptions`` and descendents.
* Added ``.crossing`` support to axes.
* Added ``.format`` support to ``Tooltip``.

* **ENHANCEMENT:** Added support for the inclusion of scripts based on features used in the chart (12).
* **ENHANCEMENT:** Added ``dict`` support to ``.style`` property on labels and titles.
* **DOCS:** Various documentation updates and fixes.
* **DEPENDENCY:** Bumped ``requests`` version for security patch.

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* **FIXED:** Problem when producing a JS literal, with the JS code inserting an unnecessary ``new`` (42 and 43).
* **ENHANCEMENT:** Added more elegant error handling when something goes wrong displaying a chart in Jupyter (43).

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