indentation indicator at document root

Hi folks,

the spec defines the indentation level of a document’s root node parent 
as -1 (9.3.1). So when the document contains a block scalar as root node 
with explicit indentation indicator, this leads to unexpected results:

%YAML 1.2
--- |1
foo

The above is valid according to spec, which says about the indentation 
indicator „This level is specified as the integer number of the 
additional indentation spaces used for the content, relative to its 
parent node“. Since -1 (parent node indentation) + 1 (given integer 
number) is 0, and that’s the indentation of the scalar "foo", this is 
valid YAML. The reference parser handles this correctly, while PyYaml 
does not. Is this intended?

Cheers,
Felix

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