How to enable fast sync and light sync?

Nodes & Mining Problems
#1

Hello everyone.
According to information: https://github.com/nknorg/nkn/releases
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This argument is not in the program system itself.

All options I found:
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I want to have an automated system for configuring my nodes with this flag. Is there a more specific operating command to enable this feature ?

#2

Hi, you can enable light sync by adding a line in config.json.