feat(shada): restore Blob globals properly

As Strings and Blobs are encoded as msgpack BINs, the current ShaDa
implementation will restore global Blob variables as Strings (or msgpack
special dicts if they contain NULs).

Encode an additional element with Blob globals to differentiate them
from Strings so that we can restore them with the correct type.

Adjust variables_spec.lua's autotest() to also check for proper type.

1 files changed, 6 insertions, 2 deletions

diff --git a/test/functional/shada/variables_spec.lua b/test/functional/shada/variables_spec.lua
index cc0e7fa537..854add1363 100644
--- a/test/functional/shada/variables_spec.lua
+++ b/test/functional/shada/variables_spec.lua
@@ -1,7 +1,7 @@
 -- ShaDa variables saving/reading support
 local helpers = require('test.functional.helpers')(after_each)
-local meths, funcs, nvim_command, eq =
-  helpers.meths, helpers.funcs, helpers.command, helpers.eq
+local meths, funcs, nvim_command, eq, eval =
+  helpers.meths, helpers.funcs, helpers.command, helpers.eq, helpers.eval
 
 local shada_helpers = require('test.functional.shada.helpers')
 local reset, clear = shada_helpers.reset, shada_helpers.clear
@@ -30,10 +30,12 @@ describe('ShaDa support code', function()
       else
         meths.set_var(varname, varval)
       end
+      local vartype = eval('type(g:' .. varname .. ')')
       -- Exit during `reset` is not a regular exit: it does not write shada
       -- automatically
       nvim_command('qall')
       reset('set shada+=!')
+      eq(vartype, eval('type(g:' .. varname .. ')'))
       eq(varval, meths.get_var(varname))
     end)
   end
@@ -47,6 +49,8 @@ describe('ShaDa support code', function()
   autotest('false', 'FALSEVAR', false)
   autotest('null', 'NULLVAR', 'v:null', true)
   autotest('ext', 'EXTVAR', '{"_TYPE": v:msgpack_types.ext, "_VAL": [2, ["", ""]]}', true)
+  autotest('blob', 'BLOBVAR', '0z12ab34cd', true)
+  autotest('blob (with NULs)', 'BLOBVARNULS', '0z004e554c7300', true)
 
   it('does not read back variables without `!` in &shada', function()
     meths.set_var('STRVAR', 'foo')