diff --git a/lua/oil/adapters/trash/freedesktop.lua b/lua/oil/adapters/trash/freedesktop.lua
index c669730..10c0749 100644
--- a/lua/oil/adapters/trash/freedesktop.lua
+++ b/lua/oil/adapters/trash/freedesktop.lua
@@ -447,7 +447,7 @@ M.render_action = function(action)
     local entry = assert(cache.get_entry_by_url(action.url))
     local meta = entry[FIELD_META]
     ---@type oil.TrashInfo
-    local trash_info = meta and meta.trash_info
+    local trash_info = assert(meta).trash_info
     local short_path = fs.shorten_path(trash_info.original_path)
     return string.format(" PURGE %s", short_path)
   elseif action.type == "move" then
@@ -561,7 +561,7 @@ M.perform_action = function(action, cb)
     local entry = assert(cache.get_entry_by_url(action.url))
     local meta = entry[FIELD_META]
     ---@type oil.TrashInfo
-    local trash_info = meta and meta.trash_info
+    local trash_info = assert(meta).trash_info
     purge(trash_info, cb)
   elseif action.type == "move" then
     local src_adapter = assert(config.get_adapter_by_scheme(action.src_url))
@@ -576,7 +576,7 @@ M.perform_action = function(action, cb)
       local entry = assert(cache.get_entry_by_url(action.src_url))
       local meta = entry[FIELD_META]
       ---@type oil.TrashInfo
-      local trash_info = meta and meta.trash_info
+      local trash_info = assert(meta).trash_info
       fs.recursive_move(action.entry_type, trash_info.trash_file, dest_path, function(err)
         if err then
           return cb(err)
@@ -607,7 +607,7 @@ M.perform_action = function(action, cb)
       local entry = assert(cache.get_entry_by_url(action.src_url))
       local meta = entry[FIELD_META]
       ---@type oil.TrashInfo
-      local trash_info = meta and meta.trash_info
+      local trash_info = assert(meta).trash_info
       fs.recursive_copy(action.entry_type, trash_info.trash_file, dest_path, cb)
     else
       error("Must be moving files into or out of trash")
diff --git a/lua/oil/adapters/trash/windows.lua b/lua/oil/adapters/trash/windows.lua
index dba1d04..f7634e1 100644
--- a/lua/oil/adapters/trash/windows.lua
+++ b/lua/oil/adapters/trash/windows.lua
@@ -266,7 +266,7 @@ M.render_action = function(action)
     local entry = assert(cache.get_entry_by_url(action.url))
     local meta = entry[FIELD_META]
     ---@type oil.WindowsTrashInfo
-    local trash_info = meta and meta.trash_info
+    local trash_info = assert(meta).trash_info
     local short_path = fs.shorten_path(trash_info.original_path)
     return string.format(" PURGE %s", short_path)
   elseif action.type == "move" then
diff --git a/lua/oil/columns.lua b/lua/oil/columns.lua
index d531a7c..e3a4395 100644
--- a/lua/oil/columns.lua
+++ b/lua/oil/columns.lua
@@ -200,7 +200,7 @@ local function is_entry_directory(entry)
     return true
   elseif type == "link" then
     local meta = entry[FIELD_META]
-    return meta and meta.link_stat and meta.link_stat.type == "directory"
+    return (meta and meta.link_stat and meta.link_stat.type == "directory") == true
   else
     return false
   end
diff --git a/lua/oil/constants.lua b/lua/oil/constants.lua
index e1ef56b..3f5a38a 100644
--- a/lua/oil/constants.lua
+++ b/lua/oil/constants.lua
@@ -2,7 +2,7 @@ local M = {}
 
 ---Store entries as a list-like table for maximum space efficiency and retrieval speed.
 ---We use the constants below to index into the table.
----@alias oil.InternalEntry any[]
+---@alias oil.InternalEntry {[1]: integer, [2]: string, [3]: oil.EntryType, [4]: nil|table}
 
 -- Indexes into oil.InternalEntry
 M.FIELD_ID = 1