How to remove extra line space on GitHub markdown bullets/lists?

Question

The GitHub markdown code:

1. First item
* subitem
1. Second item

Generates a big space between the First, Second and the subitem:

How to make the subitem close to the first item, instead of exactly on the middle of them?

This is a Photoshop I did to illustrate the correct output:

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Related questions:

1. Multi paragraph list items, OR preventing numbered list auto formatting
2. Markdown: Problems with numbered list paragraphs containing code element

Answer 1

You need to indent the sublist with at least 4 spaces:

1. First item
    * subitem
2. Second item