diff --git a/mysql_client.lua b/mysql_client.lua
index 48f741a..d1df19b 100644
--- a/mysql_client.lua
+++ b/mysql_client.lua
@@ -883,7 +883,8 @@ end
 --that's how you have to declare a varchar these days.
 function mysql.char_size(byte_size, collation)
 	charset = collation:match'^[^_]+'
-	return floor(byte_size / max_char_widths[charset] + .5)
+	local mcw = max_char_widths[charset]
+	return mcw and floor(byte_size / mcw + .5) or byte_size
 end
 
 --NOTE: MySQL doesn't give enough metadata to generate a form in a UI,
@@ -893,7 +894,7 @@ end
 local function get_field_packet(buf)
 	local col = {}
 	local _              = get_name(buf) --always "def"
-	col.schema           = get_name(buf)
+	col.db               = get_name(buf)
 	col.table_alias      = get_name(buf)
 	col.table            = get_name(buf) --name of origin table
 	col.name             = get_name(buf) --alias column name
@@ -961,6 +962,8 @@ local function get_field_packet(buf)
 	return col
 end
 
+local function tonum(x) return tonumber(x) end
+
 local function recv_field_packets(self, field_count, field_attrs, to_lua)
 	local fields = {}
 	to_lua = to_lua or self.to_lua
@@ -968,7 +971,7 @@ local function recv_field_packets(self, field_count, field_attrs, to_lua)
 		local typ, buf = recv_packet(self)
 		checkp(self, typ == 'DATA', 'bad packet type')
 		local field = get_field_packet(buf)
-		field.to_lua = to_lua or (field.type == 'number' and tonumber or nil)
+		field.to_lua = to_lua or (field.type == 'number' and tonum or nil)
 		field.index = i
 		fields[i] = field
 		fields[field.name] = field
@@ -1016,8 +1019,8 @@ function mysql.connect(opt)
 	local host = opt.host
 	local port = opt.port or 3306
 
-	mysql.note('connect', 'host=%s:%s user=%s schema=%s',
-		host, port, opt.user, opt.schema or '')
+	mysql.note('connect', 'host=%s:%s user=%s db=%s',
+		host, port, opt.user, opt.db or '')
 
 	local tcp = opt and opt.tcp or require'sock'.tcp
 	tcp = check_io(self, tcp())
@@ -1080,7 +1083,7 @@ function mysql.connect(opt)
 	buf(23)
 	set_cstring(buf, opt.user or '')
 	set_token(buf, opt.password, scramble)
-	set_cstring(buf, opt.schema or '')
+	set_cstring(buf, opt.db or '')
 	send_packet(self, buf)
 
 	local typ, buf = recv_packet(self)
@@ -1099,7 +1102,7 @@ function mysql.connect(opt)
 	end
 
 	self.charset_is_ascii_superset = self.charset and not mb_charsets[self.charset]
-	self.schema = opt.schema
+	self.db = opt.db
 	self.user = opt.user
 
 	return self
@@ -1227,7 +1230,7 @@ local function read_result(self, opt)
 					end
 					local to_lua = col.to_lua
 					if to_lua then
-						v = to_lua(v)
+						v = to_lua(v, col)
 					end
 				else
 					v = null_value
@@ -1246,7 +1249,7 @@ local function read_result(self, opt)
 				if v ~= nil then
 					local to_lua = col.to_lua
 					if to_lua then
-						v = to_lua(v)
+						v = to_lua(v, col)
 					end
 				else
 					v = null_value
@@ -1283,13 +1286,13 @@ end
 conn.get_collation = protect(get_collation)
 
 do
-local function pass(self, schema, ret, ...)
+local function pass(self, db, ret, ...)
 	if not ret then return nil, ... end
-	self.schema = schema
+	self.db = db
 	return ret, ...
 end
-function conn:use(schema)
-	return pass(self, schema, self:query('use `' .. schema .. '`'))
+function conn:use(db)
+	return pass(self, db, self:query('use `' .. db .. '`'))
 end
 end
 
diff --git a/mysql_client.md b/mysql_client.md
index 9bf6fdc..4cd596c 100644
--- a/mysql_client.md
+++ b/mysql_client.md
@@ -16,7 +16,7 @@ assert(mysql.connect{
 	port = 3306,
 	user = 'bar',
 	password = 'baz',
-	schema = 'foo',
+	db = 'foo',
 	charset = 'utf8mb4',
 	max_packet_size = 1024 * 1024,
 })
@@ -50,7 +50,7 @@ The `options` argument is a Lua table holding the following keys:
   * `port`: server's port (optional, defaults to 3306).
   * `user`: user name.
   * `password`: password (optional).
-  * `schema`: the schema to set as current schema (optional).
+  * `db`: the database to set as current database (optional).
   * `collation`: the collation used for the connection (`charset` is implied by this).
    * use `'server'` to get the server's collation and charset for the connection.
   * `charset`: the character set used for the connection.
@@ -61,7 +61,7 @@ The `options` argument is a Lua table holding the following keys:
   "ssl disabled on server" is returned.
   * `ssl_verify`: if `true`, then verifies the validity of the server SSL
   certificate (default is `false`).
-  * `to_lua = f(v) -> v` -- custom value converter (defaults to `mysql.to_lua`).
+  * `to_lua = f(v, col) -> v` -- custom value converter (defaults to `mysql.to_lua`).
 
 ### `cn:close() -> true | nil,err`
 
@@ -90,7 +90,7 @@ The `options` arg can contain:
     (but `#cols` will).
   * `to_array  = true` -- return an array of values for single-column results.
   * `null_value = val` -- value to use for `null` (defaults to `nil`).
-  * `to_lua = f(v) -> v` -- custom value converter (defaults to `cn.to_lua`).
+  * `to_lua = f(v, col) -> v` -- custom value converter (defaults to `cn.to_lua`).
   * `field_attrs = {name -> attr}` -- extra field attributes.
 
 For queries that return a result set, it returns an array of rows.
@@ -113,7 +113,7 @@ if MySQL does not return them.
 __NOTE:__ Decimals with up to 15 digits of precision and 64 bit integers
 are converted to Lua numbers by default. That limits the useful range of
 integer types to 15 significant digits. If you have other needs, provide
-your own `to_lua` (which you can set atmodule, connection and query level,
+your own `to_lua` (which you can set at module, connection and query level,
 and even per field with `field_attrs`).
 
 ### `cn:query(query, [options]) -> res,nil,cols | nil,err,errcode,sqlstate`
diff --git a/mysql_client_test.lua b/mysql_client_test.lua
index d5da66e..cc939a9 100644
--- a/mysql_client_test.lua
+++ b/mysql_client_test.lua
@@ -11,7 +11,7 @@ sock.run(function()
 		port = 3307,
 		user = 'root',
 		password = 'root',
-		schema = 'sp',
+		db = 'sp',
 		collation = 'server',
 	})