Allow block to be specified for cattr_reader, also add default param

[eamonn-webster]

My use case is to a reader only class attribute, but then I must be able to specify the initial value with a block or via default:

[eamonn-webster]

@andrewhavens / @wndxlori: the existing specs fail locally for me, something appears broken in the Duration code implementing 2.days.ago. I don't use that code, I'll try to take a look when I get a chance.

[wndxlori]

given for instance

[wndxlori]

@andrewhavens / @wndxlori: the existing specs fail locally for me, something appears broken in the Duration code implementing 2.days.ago. I don't use that code, I'll try to take a look when I get a chance.

I seem to remember getting stuck on that issue the last time I was attempting a fix in here. Thanks if you can figure it out!

[eamonn-webster]

@wndxlori I can fix it by making Duration an ordinary class, i.e. drop the inherit from BasicObject. But I have no idea why it is failing. I guess that's a question for @amirrajan

[wndxlori]

@wndxlori I can fix it by making Duration an ordinary class, i.e. drop the inherit from BasicObject. But I have no idea why it is failing. I guess that's a question for @amirrajan

I'm on board with that. If the specs run, let's

[eamonn-webster]

This is the error when MotionSupport::Duration inherits from BasicObject

Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   <translation info unavailable>	       0x100ee045c ???
1   CoreFoundation                	       0x109c798ed __methodDescriptionForSelector + 75
2   CoreFoundation                	       0x109c79a5a -[NSObject(NSObject) methodSignatureForSelector:] + 30
3   MotionSupport                 	       0x10040d960 rb_objc_supports_forwarding + 48
4   MotionSupport                 	       0x1004290e9 rb_vm_dispatch + 1273
5   MotionSupport                 	       0x100380d8a coerce_body + 202
6   MotionSupport                 	       0x10044eca1 rb_rescue2 + 113
7   MotionSupport                 	       0x100374498 rb_objc_num_coerce_bin + 72
8   MotionSupport                 	       0x10042a6e3 rb_vm_dispatch + 6899
9   MotionSupport                 	       0x1000c3abd vm_dispatch + 1325
10  MotionSupport                 	       0x1000c44ab vm_fast_mult + 795
11  MotionSupport                 	       0x1000c6625 rb_scope__days__ + 149 (time.rb:46)