Introduce credit type
Take a safer head of a YAMLListNode
Construct YAML node from YAML node, isEmpty a la List
Code beautification, better error handling
Integer node for the YAML tree
Use the YAML types introduced yesterday, docs
Head and tail list operations
Introduce some helper classes for manipulating YAML and start modelling of credit definitions.
Parse cron strings as time duration specifications
Remove var qualifiers from case class arguments
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