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General cases

Input	Live	Sandbox	User:Stelio/Roman
0	N	N	N
1	I	I	I
2	II	II	II
3	III	III	III
4	IV	IV	IV
5	V	V	V
6	VI	VI	VI
7	VII	VII	VII
8	VIII	VIII	VIII
9	IX	IX	IX
10	X	X	X
11	XI	XI	XI
12	XII	XII	XII
13	XIII	XIII	XIII
14	XIV	XIV	XIV
15	XV	XV	XV
16	XVI	XVI	XVI
17	XVII	XVII	XVII
18	XVIII	XVIII	XVIII
19	XIX	XIX	XIX
20	XX	XX	XX
31	XXXI	XXXI	XXXI
32	XXXII	XXXII	XXXII
33	XXXIII	XXXIII	XXXIII
34	XXXIV	XXXIV	XXXIV
35	XXXV	XXXV	XXXV
36	XXXVI	XXXVI	XXXVI
37	XXXVII	XXXVII	XXXVII
38	XXXVIII	XXXVIII	XXXVIII
39	XXXIX	XXXIX	XXXIX
40	XL	XL	XL
41	XLI	XLI	XLI
42	XLII	XLII	XLII
43	XLIII	XLIII	XLIII
44	XLIV	XLIV	XLIV
45	XLV	XLV	XLV
46	XLVI	XLVI	XLVI
47	XLVII	XLVII	XLVII
48	XLVIII	XLVIII	XLVIII
49	XLIX	XLIX	XLIX
50	L	L	L
90	XC	XC	XC
91	XCI	XCI	XCI
92	XCII	XCII	XCII
93	XCIII	XCIII	XCIII
94	XCIV	XCIV	XCIV
95	XCV	XCV	XCV
96	XCVI	XCVI	XCVI
97	XCVII	XCVII	XCVII
98	XCVIII	XCVIII	XCVIII
99	XCIX	XCIX	XCIX
100	C	C	C
101	CI	CI	CI
102	CII	CII	CII
103	CIII	CIII	CIII
104	CIV	CIV	CIV
105	CV	CV	CV
106	CVI	CVI	CVI
107	CVII	CVII	CVII
108	CVIII	CVIII	CVIII
109	CIX	CIX	CIX
1000	M	M	M
1234	MCCXXXIV	MCCXXXIV	MCCXXXIV
2999	MMCMXCIX	MMCMXCIX	MMCMXCIX
3000	MMM	MMM	MMM
4999	IVCMXCIX	IVCMXCIX	IVCMXCIX
5000	V	V	V
5001	VI	VI	VI
49999	XLIXCMXCIX	XLIXCMXCIX	XLIXCMXCIX
50000	L	L	L
50001	LI	LI	LI
69105	LXIXCV	LXIXCV	LXIXCV
69105	LXIXCV	LXIXCV	LXIXCV
999999	CMXCIXCMXCIX	CMXCIXCMXCIX	CMXCIXCMXCIX
1000000	M	M	M
4999999	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIX

Numbers exceeding 4999999

Input	Live	Sandbox	User:Stelio/Roman
5000000	N/A	N/A	5000000 is too big to be converted to Roman numerals
5000010	N/A	N/A	5000010 is too big to be converted to Roman numerals
3000000000	N/A	N/A	3000000000 is too big to be converted to Roman numerals

Custom messages when too big

Input	Live	Sandbox	User:Stelio/Roman
5000010 with "too big"	too big	too big	too big
5000010 with "??"	??	??	??

Sandbox params validation

Sandbox w/ '1000|too big': M
Sandbox with '1000|fraction=yes|too big': M
Sandbox with '1000|too big|fraction=yes': M
Sandbox w/ '4210987|too big': MMMMCCXCMLXXXVII
Sandbox with '4210987|fraction=yes|too big': MMMMCCXCMLXXXVII
Sandbox with '4210987|too big|fraction=yes': MMMMCCXCMLXXXVII
Sandbox w/ '4210987.1|too big': MMMMCCXCMLXXXVII
Sandbox with '4210987.1|fraction=yes|too big': MMMMCCXCMLXXXVII•Ƨ»»»»»
Sandbox with '4210987.1|too big|fraction=yes': MMMMCCXCMLXXXVII•Ƨ»»»»»
Sandbox w/ '5000010|too big': too big
Sandbox with '5000010|fraction=yes|too big': too big
Sandbox with '5000010|too big|fraction=yes': too big
Sandbox w/ '3000000000|too big': too big
Sandbox with '3000000000|fraction=yes|too big': too big
Sandbox with '3000000000|too big|fraction=yes': too big

Decimal cases between 0 and 1

Input	Sandbox with fraction=yes	User:Stelio/Roman
0.0001	»	N
0.0005	»	»
0.00057	»	»
0.000578703	»	»
0.000578704	»	»
0.00347222	℈
0.00347223	℈	℈
0.007	Ƨ	ƻ
0.0139	Ƨ	Ƨ
0.02084	Ɔ	Ɔ
0.0278	ƧƧ	ƧƧ
0.04167	Є	Є
0.08334	•	•
0.142858	•ЄƧ℈»	•ЄƧ℈»
0.1667	:	:
0.2	:ƧƧ℈»»»»	:ƧƧ℈»»»»
0.25	:•	:•
0.3333	::	:•ЄƧƧƻ℈
.3333	::	:•ЄƧƧƻ℈
0.3334	::	::
0.34	::Ƨ	::℈
0.4	::ЄƆ℈»	::ЄƆ℈»
0.41666	:•:	::ЄƧƧƻ℈
0.41667	:•:	:•:
0.42	:•:℈	:•:
0.5	S	S
0.55	SЄƧ»»	SЄƻ»»
0.6	S•Ƨ»»»»»	S•Ƨ»»»»»
0.7	S:ƧƧ℈»»»»	S:ƧƧ℈»»»»
0.75	S:•	S:•
0.95	S:•:ƧƧ℈»»»»	S:•:ƧƧ℈»»»»
0.9999	S:•:ЄƧƧƧ℈»»»»»	S:•:ЄƧƧƻ℈
0.999999	S:•:ЄƧƧƧ℈»»»»»	S:•:ЄƧƧƻ℈

Fractional cases between 0 and 1

Input	Sandbox with fraction=yes	User:Stelio/Roman
1/1728	»	»
1/288	℈	℈
1/144	Ƨ	ƻ
1/72	Ƨ	Ƨ
1/48	Ɔ	Ɔ
1/36	ƧƧ	ƧƧ
1/24	Є	Є
1/12	•	•
1/7	•ЄƧ℈»	•ЄƧ℈»
1/6	:	:
1/5	:ƧƧ℈»»»»	:ƧƧ℈»»»»
1/4	:•	:•
1/3	::	::
5/12	:•:	:•:
1/2	S	S
2/3	S:	S:
14/17	S:•ЄƧƧ℈»	S:•ЄƧƧ℈»
5/6	S::	S::
71/72	S:•:ЄƧƧ	S:•:ЄƧƧ
999/1000	S:•:ЄƧƧƧ℈»»»»	S:•:ЄƧƧƻ℈»»»»
1727/1728	S:•:ЄƧƧƧ℈»»»»»	S:•:ЄƧƧƻ℈»»»»»
9999/10000	S:•:ЄƧƧƧ℈»»»»»	S:•:ЄƧƧƻ℈

Negative, decimal/fractional, arithmetic, and misc corner cases

Input	Live	Sandbox	Sandbox with fraction=yes	User:Stelio/Roman
-1	Lua error: Invalid number -1.	Lua error: Invalid number -1.	Lua error: Invalid number -1.	Negative numbers (such as -1) cannot be converted to Roman numerals
-1234	Lua error: Invalid number -1234.	Lua error: Invalid number -1234.	Lua error: Invalid number -1234.	Negative numbers (such as -1234) cannot be converted to Roman numerals
177/3.5	L	L	LSЄƧƧ»»»	LSЄƧƧ»»»
50.572	L	L	LSЄƧƧ»»»»	LSЄƧƧ»»»»
1+1	II	II	II	II
10-1	IX	IX	IX	IX
4*8	XXXII	XXXII	XXXII	XXXII
80/2	XL	XL	XL	XL
2^8	CCLVI	CCLVI	CCLVI	CCLVI
105.5	CV	CV	CVS	CVS
2999.765432	MMCMXCIX	MMCMXCIX	MMCMXCIXS:•Ƨ»»»	MMCMXCIXS:•Ƨ»»»
3000.22638	MMM	MMM	MMM:ЄƧ℈»	MMM:ЄƧ℈»
69105.8	LXIXCV	LXIXCV	LXIXCVS:•ЄƧ»»	LXIXCVS:•Єƻ»»
4999999 1727/1728	Lua error: Invalid number 4999999 1727/1728.	Lua error: Invalid number 4999999 1727/1728.	Lua error: Invalid number 4999999 1727/1728.	Expression error: Unexpected number.
4999999.9999999	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIXS:•:ЄƧƧƧ℈»»»»»	4999999.9999999 is too big to be converted to Roman numerals
4999999+1727/1728	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIXS:•:ЄƧƧƧ℈»»»»»	MMMMCMXCIXCMXCIXS:•:ЄƧƧƻ℈»»»»»
4,999,999 1727/1728	Lua error: Invalid number 4,999,999 1727/1728.	Lua error: Invalid number 4,999,999 1727/1728.	Lua error: Invalid number 4,999,999 1727/1728.	Expression error: Unrecognized punctuation character ",".
5000001-2	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIX	MMMMCMXCIXCMXCIX