Blender 2.8 API - grid_scale? in v2.79 the following works:

bpy.context.space_data.grid_scale = 0.25
bpy.ops.view3d.snap_selected_to_grid()


but v2.8 doesn't know bpy.context.space_data.grid_scale

What is the equivalent command in v2.8?

many thanks,
 Smooth
In v2.81 I am changing it like this:

import bpy

for area in bpy.context.screen.areas:
    if area.type == 'VIEW_3D':
        area.spaces.active.overlay.grid_scale = 0.25