Add ALLOW_DUPLICATE_KEYS_TO_ARRAY flag for collect values from duplic… (

#88)

* Add ALLOW_DUPLICATE_KEYS_TO_ARRAY flag for collect values from duplicate keys in reserved property object (key array) `__duplicates__`

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Co-authored-by: Jordi Boggiano <[email protected]>

Avoid leaking more than one character when showing position of a file…

… that is clearly not json

Fix phpstan build

Update changelog/readme

Update to latest phpstan

Merge pull request #79 from glaubinix/f/lexer-none-terminating-string

Lexer: fix handling of cut off json where string don't terminate

Merge pull request #77 from reedy/patch-1

Create .gitattributes

use @phpstan- prefix instead of @psalm- (#74)

Update CHANGELOG.md

Update changelog