Markdown reader: Properly handle boolean values in YAML metadata.

This fixes a regression in 2.2.3, which cause boolean values to
be parsed as MetaInlines instead of MetaBool.

Note also an undocumented (but desirable) change in 2.2.3:
numbers are now parsed as MetaInlines rather than MetaString.

Closes #4819.

1 files changed, 50 insertions, 0 deletions

diff --git a/test/command/4819.md b/test/command/4819.md
new file mode 100644
index 000000000..548583387
--- /dev/null
+++ b/test/command/4819.md
@@ -0,0 +1,50 @@
+```
+% pandoc -f markdown -t native -s
+---
+foo: 42
+...
+^D
+Pandoc (Meta {unMeta = fromList [("foo",MetaInlines [Str "42"])]})
+[]
+```
+
+```
+% pandoc -f markdown -t native -s
+---
+foo: true
+...
+^D
+Pandoc (Meta {unMeta = fromList [("foo",MetaBool True)]})
+[]
+```
+
+```
+% pandoc -f markdown -t native -s
+---
+foo: True
+...
+^D
+Pandoc (Meta {unMeta = fromList [("foo",MetaBool True)]})
+[]
+```
+
+```
+% pandoc -f markdown -t native -s
+---
+foo: FALSE
+...
+^D
+Pandoc (Meta {unMeta = fromList [("foo",MetaBool False)]})
+[]
+```
+
+```
+% pandoc -f markdown -t native -s
+---
+foo: no
+...
+^D
+Pandoc (Meta {unMeta = fromList [("foo",MetaInlines [Str "no"])]})
+[]
+```
+