Empties
A key without any operator (:, =, <, etc.) specifies an "empty". Empties
are a distinct element type with two primary usecases - the first one is as a
global flag/switch/boolean:
enable_debugging!
LOG_LEVEL_INFO
utf_8
The second main usecase is as a spacer or key-only element in an ordered collection, e.g. inside some custom markup DSL:
header
heading: New stable release available
padding
-- text
Today we've released our new stable version (codenamed "Leverage")
which will be available on all release channels by midday, ...
-- text
footer
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