message: Update Grammar.md
  * Update Grammar.md
  Some consistency fixes to the grammar file
  * Some more minor fixes to Grammar.md
  * Update Grammar.md
diff: @@ -35,9 +35,9 @@ enumval\_decl = ident [ `=` integer\_constant ]
  metadata = [ `(` commasep( ident [ `:` single\_value ] ) `)` ]
  -scalar = integer\_constant | float\_constant
  +scalar = boolean\_constant | integer\_constant | float\_constant
  -object = { commasep( ident `:` value ) }
  +object = `{` commasep( ident `:` value ) `}`
  single\_value = scalar | string\_constant
  @@ -69,6 +69,6 @@ hex\_float\_constant = `[-+]?0[xX](([.][:xdigit:]+)|([:xdigit:]+[.][:xdigit:]*)|
  special\_float\_constant = `[-+]?(nan|inf|infinity)`
  -float\_constant = decimal\_float\_constant | hexadecimal\_float\_constant | special\_float\_constant
  +float\_constant = dec\_integer\_constant | hex\_integer\_constant | special\_float\_constant
  -boolean\_constant = `(true|false)` | (integer\_constant ? `true` : `false`)
  +boolean\_constant = `true` | `false`
  