Avoid using platform-dependent floats in test case.

The number of decimals printed for floats varied in this test case, as
noted by several buildfarm members. There's nothing special about floats
and arrays in the code being tested, so replace the floats with numerics to
make the output platform-independent.

src/pl/plpython/expected/plpython_types.out

@@ -568,24 +568,13 @@ INFO:  ([[[1L, 2L, None], [None, 5L, 6L]], [[None, 8L, 9L], [10L, 11L, 12L]]], <
  {{{1,2,NULL},{NULL,5,6}},{{NULL,8,9},{10,11,12}}}
 (1 row)
 
-CREATE FUNCTION test_type_conversion_array_float4(x float4[]) RETURNS float4[] AS $$
+CREATE FUNCTION test_type_conversion_array_numeric(x numeric[]) RETURNS numeric[] AS $$
 plpy.info(x, type(x))
 return x
 $$ LANGUAGE plpythonu;
-SELECT * FROM test_type_conversion_array_float4(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::float4[]);
-INFO:  ([[[1.2000000476837158, 2.299999952316284, None], [None, 5.699999809265137, 6.800000190734863]], [[None, 8.899999618530273, 9.345000267028809], [10.123000144958496, 11.456000328063965, 12.676799774169922]]], <type 'list'>)
-                      test_type_conversion_array_float4                       
-------------------------------------------------------------------------------
- {{{1.2,2.3,NULL},{NULL,5.7,6.8}},{{NULL,8.9,9.345},{10.123,11.456,12.6768}}}
-(1 row)
-
-CREATE FUNCTION test_type_conversion_array_float8(x float8[]) RETURNS float8[] AS $$
-plpy.info(x, type(x))
-return x
-$$ LANGUAGE plpythonu;
-SELECT * FROM test_type_conversion_array_float8(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::float8[]);
-INFO:  ([[[1.2, 2.3, None], [None, 5.7, 6.8]], [[None, 8.9, 9.345], [10.123, 11.456, 12.6768]]], <type 'list'>)
-                      test_type_conversion_array_float8                       
+SELECT * FROM test_type_conversion_array_numeric(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::numeric[]);
+INFO:  ([[[Decimal('1.2'), Decimal('2.3'), None], [None, Decimal('5.7'), Decimal('6.8')]], [[None, Decimal('8.9'), Decimal('9.345')], [Decimal('10.123'), Decimal('11.456'), Decimal('12.6768')]]], <type 'list'>)
+                      test_type_conversion_array_numeric                      
 ------------------------------------------------------------------------------
  {{{1.2,2.3,NULL},{NULL,5.7,6.8}},{{NULL,8.9,9.345},{10.123,11.456,12.6768}}}
 (1 row)

src/pl/plpython/expected/plpython_types_3.out

@@ -568,24 +568,13 @@ INFO:  ([[[1, 2, None], [None, 5, 6]], [[None, 8, 9], [10, 11, 12]]], <class 'li
  {{{1,2,NULL},{NULL,5,6}},{{NULL,8,9},{10,11,12}}}
 (1 row)
 
-CREATE FUNCTION test_type_conversion_array_float4(x float4[]) RETURNS float4[] AS $$
+CREATE FUNCTION test_type_conversion_array_numeric(x numeric[]) RETURNS numeric[] AS $$
 plpy.info(x, type(x))
 return x
 $$ LANGUAGE plpython3u;
-SELECT * FROM test_type_conversion_array_float4(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::float4[]);
-INFO:  ([[[1.2000000476837158, 2.299999952316284, None], [None, 5.699999809265137, 6.800000190734863]], [[None, 8.899999618530273, 9.345000267028809], [10.123000144958496, 11.456000328063965, 12.676799774169922]]], <class 'list'>)
-                      test_type_conversion_array_float4                       
-------------------------------------------------------------------------------
- {{{1.2,2.3,NULL},{NULL,5.7,6.8}},{{NULL,8.9,9.345},{10.123,11.456,12.6768}}}
-(1 row)
-
-CREATE FUNCTION test_type_conversion_array_float8(x float8[]) RETURNS float8[] AS $$
-plpy.info(x, type(x))
-return x
-$$ LANGUAGE plpython3u;
-SELECT * FROM test_type_conversion_array_float8(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::float8[]);
-INFO:  ([[[1.2, 2.3, None], [None, 5.7, 6.8]], [[None, 8.9, 9.345], [10.123, 11.456, 12.6768]]], <class 'list'>)
-                      test_type_conversion_array_float8                       
+SELECT * FROM test_type_conversion_array_numeric(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::numeric[]);
+INFO:  ([[[Decimal('1.2'), Decimal('2.3'), None], [None, Decimal('5.7'), Decimal('6.8')]], [[None, Decimal('8.9'), Decimal('9.345')], [Decimal('10.123'), Decimal('11.456'), Decimal('12.6768')]]], <class 'list'>)
+                      test_type_conversion_array_numeric                      
 ------------------------------------------------------------------------------
  {{{1.2,2.3,NULL},{NULL,5.7,6.8}},{{NULL,8.9,9.345},{10.123,11.456,12.6768}}}
 (1 row)

src/pl/plpython/sql/plpython_types.sql

@@ -247,19 +247,12 @@ $$ LANGUAGE plpythonu;
 
 SELECT * FROM test_type_conversion_array_int8(ARRAY[[[1,2,NULL],[NULL,5,6]],[[NULL,8,9],[10,11,12]]]::int8[]);
 
-CREATE FUNCTION test_type_conversion_array_float4(x float4[]) RETURNS float4[] AS $$
+CREATE FUNCTION test_type_conversion_array_numeric(x numeric[]) RETURNS numeric[] AS $$
 plpy.info(x, type(x))
 return x
 $$ LANGUAGE plpythonu;
 
-SELECT * FROM test_type_conversion_array_float4(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::float4[]);
-
-CREATE FUNCTION test_type_conversion_array_float8(x float8[]) RETURNS float8[] AS $$
-plpy.info(x, type(x))
-return x
-$$ LANGUAGE plpythonu;
-
-SELECT * FROM test_type_conversion_array_float8(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::float8[]);
+SELECT * FROM test_type_conversion_array_numeric(ARRAY[[[1.2,2.3,NULL],[NULL,5.7,6.8]],[[NULL,8.9,9.345],[10.123,11.456,12.6768]]]::numeric[]);
 
 CREATE FUNCTION test_type_conversion_array_date(x date[]) RETURNS date[] AS $$
 plpy.info(x, type(x))